Increased syphilis trend among patients in an AIDS information and prevention center

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array:2 [ "etiqueta" => "e" "identificador" => "aff0025" ] ] ] ] "afiliaciones" => array:5 [ 0 => array:3 [ "entidad" => "The Biomedical Research Center Network for Epidemiology and Public Health (CIBERESP), Spain" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Center for Public Health Research (CSIPS), Valencia, Spain" "etiqueta" => "b" "identificador" => "aff0010" ] 2 => array:3 [ "entidad" => "Valencian Center for AIDS Information and Prevention, Valencia, Spain" "etiqueta" => "c" "identificador" => "aff0015" ] 3 => array:3 [ "entidad" => "Center for Sexual and HIV Research, London, UK" "etiqueta" => "d" "identificador" => "aff0020" ] 4 => array:3 [ "entidad" => "Biostatistics Unit, Barcelona Center for International Health Research (CRESIB), Barcelona, Spain" "etiqueta" => "e" "identificador" => "aff0025" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Incremento en la tendencia de sífilis entre los usuarios de un centro de información y prevención del sida" ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1896 "Ancho" => 1979 "Tamanyo" => 168911 ] ] "descripcion" => array:1 [ "en" => "Trend in the prevalence (%) of cases of syphilis infection by risky sexual practice in men who have sex with men (MSM) and heterosexuals (HT) first attending the AIDS Information and Prevention Center between 2000 and 2006." ] ] ] "textoCompleto" => "IntroductionA rebound of syphilis cases has recently been observed in various European countries, the United States and Canada<a class="elsevierStyleCrossRefs" href="#bib0005">1–4</a>, especially from 2000 onwards. This increase is associated mainly with men who have sex with men (MSM)<a class="elsevierStyleCrossRef" href="#bib0025">5</a> and could also be related to an increase in the incidence of HIV<a class="elsevierStyleCrossRefs" href="#bib0010">2,6,7</a>. Several hypotheses have been formulated to explain this increase. On the one hand, the spread of combined antiretroviral therapy and its effect of improving survival has increased the number of HIV infected people who maintain active sexual relationships<a class="elsevierStyleCrossRef" href="#bib0040">8</a>. On the other hand, in the last few years, there has been a relaxation in the use of preventive measures for risky sexual relationships among MSM<a class="elsevierStyleCrossRefs" href="#bib0045">9,10</a>, which is also associated with an increase in the use of non-injected recreational drugs such as ecstasy, etc.<a class="elsevierStyleCrossRef" href="#bib0055">11</a>. Therefore, sexually transmitted infections could be increasing in parallel with an increase in HIV transmission<a class="elsevierStyleCrossRef" href="#bib0060">12</a>. In Spain, epidemiological surveillance of sexually transmitted diseases is far from exhaustive, although data can be obtained from both the Notifiable Diseases Surveillance System and the Microbiological Information System, the latter gathering information nationally from a network of laboratories in different regions. Aside from the quality of the surveillance system, a change in the trend from 2003 onwards has been observed, with an increase in syphilis incidence.The objective of this study was to describe the trend in syphilis infection in the last few years among persons attending the AIDS Information and Prevention Center (CIPS) in Valencia, Spain.Subjects and methodsA cross-sectional study was carried out, with all persons making a first visit to the AIDS Information and Prevention Center in Valencia, the third largest city in Spain, from 2000 to 2006 and who reported being at risk of transmission either through HIV infection or by another sexually transmitted diseases such as syphilis. AIDS Information and Prevention Centers are public health centers located in several cities of the autonomous region of Valencia, established by the regional government by the end of 1987. People access these centers either spontaneously or are referred by other health or social centres. These centers provide free, confidential free information and counseling about HIV/AIDS and also carry out serological tests for HIV, hepatitis A, B and C viruses, and syphilis. Before serological testing with blood extraction is performed, a personal face-to-face interview is carried out by health professionals to gather information on different sociodemographic variables and risk practices. Clinic attendees receive pre- and post-test information and counseling on HIV preventive measures. Attendees are also offered vaccination against hepatitis A and B viruses. Persons reporting HIV risk behaviors are invited to attend the center every 6 months. All persons attending the center are tested to determine the presence or absence of antibodies to HIV at distinct visits.To determine the presence of HIV antibodies, enzyme immunoanalysis (ELISA) was used, while the Western Blot test was employed to confirm positive results. Indirect diagnostic techniques, based on antibody detection within the patient's serum, were used for syphilis diagnosis. Firstly, a non-treponemic test of macroscopic flocculation, Rapid Plasma Reagin (RPR, Card Antigen, Becton-Dickinson), with high sensitivity but low specificity was used. If a positive result of this test was obtained, a treponemic test, Elisa IgG (Treponema screen Liason, Sorin Biomedica) was used to confirm the presence of infection. A case of syphilis was diagnosed when both tests showed a positive result. In cases of discrepancy, a second test was performed, repeating the RPR and using a second treponemal test, FTA-ABS (climb-Spot-IF, BioMerieux). The antibody titers of the non-treponemic tests were established quantitatively, and a quadruple change in the titer was considered to show a substantial difference between the results of the two tests. Cases and the percentage of syphilis per year were described according to the characteristics and sexual risk practices of the persons visiting the AIDS Information and Prevention Center during the study period.For MSM, there was additional information about sexual practices from 2000 to 2004. Data on sexual activity (receptive and/or insertive anal penetration), oral sex and the use of condoms in the distinct practices were available. Information on the number of partners within the previous 6 months or during the previous year and on whether attendees had had contact with prostitution was collected. Data on sociodemographic status, educational level and country of origin were also collected. In addition, information was gathered on drug consumption and the way drugs were consumed for heroin, cocaine, cannabis and other substances.The calendar effect was assessed by a logistic regression model adjusted for sexual and sociodemographic variables. The presence of an interaction between adjusted variables and calendar period was investigated. Since measurements for subjects differed over time and were not independent, we used a robust estimate for the confidence intervals presented. A likelihood test was used to include variables with a p–value of 0.05 or less. We used STATA 9.0 for the data analysis.ResultsAmong the 10,850 subjects attending the AIDS Information and Prevention Center, the overall prevalence of syphilis was 0.7%. No substantial changes were observed in the study period, except for 2006 when the percentage of subjects with syphilis reached 1.4%. Among persons attending the AIDS Information and Prevention Center, 71% were heterosexuals (HT), 19% were MSM and 10% were injecting drug users (IDU). Over the years, the proportion of HT increased from 63% in 2000 to 75% in 2006, implying a reduction in cases among IDU from 19% to 5%. The proportion of MSM was stable for the whole period. HIV coinfection was found in 6.3% of MSM and 2.5% of HT diagnosed with syphilis.Among MSM, the overall prevalence of syphilis was around 2.4% for the entire period. At the beginning of the study period, the prevalence was around 0.7% and an increase was only observed from 2003, peaking at a prevalence of 4.6% in 2006 (<a class="elsevierStyleCrossRef" href="#fig0005">fig. 1</a>). The prevalence of syphilis among HT for the whole period was very low with no substantial increases (<a class="elsevierStyleCrossRef" href="#fig0005">fig. 1</a>). No differences were observed between men and women.<elsevierMultimedia ident="fig0005"></elsevierMultimedia>A total of 1,475 MSM attended the center during the study period, but syphilis serology was only available for 1,387. These subjects made a total of 2,360 visits. For all these visits an exhaustive analysis of declared sexual activities and drug use was carried out to assess the association of these practices with infection.After fitting a univariate logistic regression model, we observed that the risk of having syphilis was higher for men who practiced prostitution (OR=10.64; 95%CI: 4.22-26.85), as well as for those who reported use of non-injected recreational drugs (ecstasy, methamphetamine, etc.) (OR=4.63; 95%CI: 1.37-15.66). The highest risk was observed for 2004. A lower risk was observed among MSM with high educational level (<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>).<elsevierMultimedia ident="tbl0005"></elsevierMultimedia>The multivariate analysis showed that subjects with a university education had a lower risk of infection (OR=0.10; 95%CI: 0.03-0.59) than those without higher education. However, the risk was higher for those who took drugs other than heroin or cocaine (OR=5.49; 95%CI: 1.55-19.43) and those who practiced prostitution (OR=6.83; 95% CI: 2.52-18.53). The highest risk of having syphilis was found in the final year of the study period (OR=5.05; 95%CI: 1.12-22.72). No significant interaction was found between sociodemographic variables and calendar period (<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>).DiscussionCases of syphilis infection substantially increased among MSM attending the AIDS Information and Prevention Center, especially in recent years, with no major variations in the percentage of MSM who took distinct serological tests. The prevalence of syphilis infection was related to educational level, prostitution and the use of non-injected recreational drugs.A similar increase has been identified in several European countries and the USA<a class="elsevierStyleCrossRefs" href="#bib0015">3,6,13</a>. Moreover, a rise in risky behavior among MSM was evidently related to the use of psychotropic substances and unprotected sexual practices, which may favor the increase in infection<a class="elsevierStyleCrossRef" href="#bib0070">14</a>. The rise in syphilis cases in Spain has also been described by a growing trend in the number of cases during the last few years<a class="elsevierStyleCrossRef" href="#bib0075">15</a>. An increase in the incidence of syphilis among male homosexuals was detected in a study carried out in a center for sexually transmitted infections in Madrid<a class="elsevierStyleCrossRef" href="#bib0080">16</a> and in several studies carried out in Barcelona<a class="elsevierStyleCrossRefs" href="#bib0050">10,17</a>. The increase in the number of subjects who sought counseling at the AIDS Information and Prevention Center regarding risk practices in their heterosexual relations was not accompanied by an increase in the number of syphilis cases, as occurred in other cities such as Amsterdam<a class="elsevierStyleCrossRef" href="#bib0090">18</a>.Several studies have established associations between sociodemographic variables and the risk of HIV infection among MSM. Men with a low educational level evidently have a greater probability of engaging in risky sexual relations and therefore an increased probability of being infected. However, the relationship between sociodemographic variables and syphilis is less clear. Although we found no significant differences, our data indicated that the number of syphilis cases was greater among men who had not completed primary education. Several studies have shown that the use of drugs, such as meta-amphetamine or designer drugs, increases the probability of having unprotected sexual relations without proper use of condoms and also increases the number of partners<a class="elsevierStyleCrossRefs" href="#bib0070">14,19,20</a>. This behavior has been associated with an increase in the risk of syphilis infection.This study has certain limitations related to selection bias among persons attending the AIDS Information and Prevention Center, mainly due to changes in the characteristics of the subjects requesting the services of this center. When established, the center was one of the few places where the HIV test could be carried out anonymously and for free. The AIDS pattern has gradually changed, and the HIV test has been incorporated into the public health system. The AIDS Information and Prevention Center has always been the referral center for most IDU starting a drug use cessation program, as they were referred to the center for HIV testing. Changes in the characteristics of this group are related to changes in the characteristics of the IDU population and therefore selection bias should be relatively small. For other risk practices, changes in the location of the AIDS Information and Prevention Center could account for alterations in the user pattern. However, the center has been at the same place for the last 6 years and therefore an increase in syphilis cases among MSM could not be explained by location changes alone. Moreover, although figures on infection do not reflect the real prevalence or incidence, we believe that the stability and accessibility of this center allowed us to identify trend changes.Whether an increase in syphilis cases implies an increase in HIV-infected cases is controversial. A recent study carried out in San Francisco observed that a rise in syphilis cases among MSM was not related to an increase in HIV cases<a class="elsevierStyleCrossRef" href="#bib0030">6</a>. In France, Amsterdam and Denmark, the HIV epidemic among MSM remained stable, although an increase in syphilis was observed<a class="elsevierStyleCrossRefs" href="#bib0105">21,22</a>. However, in Germany, both HIV and syphilis cases increased among MSM in 2003 compared with previous years<a class="elsevierStyleCrossRef" href="#bib0035">7</a>. In this case the relationship between HIV infection and the syphilis epidemic was clear, because there was a synergy between the two infections and therefore an increase in the incidence of syphilis may contribute to an increase in HIV transmission<a class="elsevierStyleCrossRef" href="#bib0035">7</a>. In Spain, an increase in HIV cases<a class="elsevierStyleCrossRef" href="#bib0115">23</a> among MSM was observed in the last few years. According to the HIV Register, the category of homo/bisexual transmission has increased from 26.9% in 2003 to 33.8% in 2005 and to 35.8% in 2006.The phenomenon of the increase in syphilis cases and the HIV/AIDS epidemic is not homogeneous. Both local and general plans are required to identify distinct priorities and take decisions that are appropriate to each real-life scenario. The increase observed justifies the need to improve surveillance systems and to accompany these measures with preventive actions so that intervention mechanisms are directed toward the target population in which they will be most effective. For this reason, more active and specific preventive actions should be implemented in venues such as saunas and bars or places where MSM visit to contact possible sexual partners in order to inform this collective about possible hazards and the increase in new infections.AuthorshipI. Hurtado, designed the study. I. Hurtado and S. Pérez-Hoyos carried out the statistical analysis. I. Alastrue and T. Tasa were responsible for data collection. S. Pérez-Hoyos set up the original study and collaborated in its design. I. Hurtado, S. Pérez-Hoyos, M. Pavlou and I. Alastrue recorded and interpreted the results. All of the authors revised the different versions of the manuscript.SponsorshipThis work was financed by grants from the Consellería de Sanitat de la Generalitat Valenciana B12/03 and B15/04.Conflict of interestNone." 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This study describes the trend in syphilis infection among persons attending the AIDS information and prevention center of Valencia, Spain. MethodsWe performed a cohort study of all persons attended from 2000 to 2006. The calendar effect was assessed by a logistic regression model adjusted by sexual and sociodemographic variables. ResultsA total of 71% were heterosexuals (HT) and 19% were men who had sex with men (MSM). Among the 10,850 users of the center, the prevalence of syphilis was 0.7%. Among MSM, the prevalence of syphilis was 2.4% for the whole period and was 4.6% for 2006. Multivariate analysis showed that the risk of infection was lower in persons with a university education (OR=0.10; 95%CI: 0.03-0.59) than in those without. The risk was higher in persons who took drugs (OR=5.49; 95%CI: 1.55-19.43) or who practiced prostitution (OR=6.83; 95%CI: 2.52-18.53). In 2006, the risk of having syphilis was greater (OR=5.05; 95%CI: 1.12-22.72). ConclusionsSyphilis infection increased substantially among MSM. In this collective, the prevalence of infection is related to educational level, prostitution and the use of non-injected recreational drugs." ] "es" => array:2 [ "titulo" => "Resumen" "resumen" => "ObjetivoEn los últimos años se ha observado un repunte en los casos de sífilis. Este estudio describe la evolución de la infección por sífilis entre las personas que asistieron a un centro de información y prevención del sida de Valencia, España. MétodosSe realizó un estudio de cohorte de todas las personas atendidas entre 2000 y 2006. El efecto calendario se evaluó mediante un modelo de regresión logística ajustando por variables sociodemográficas y sexuales. ResultadosEl 71% de los que acudieron al centro eran heterosexuales y el 19% eran hombres que tenían sexo con hombres (HSH). Entre los 10.850 individuos, la prevalencia de la sífilis fue del 0,7%. Entre los HSH, la prevalencia de la sífilis fue del 2,4% para todo el período y del 4,6% para 2006. El análisis multivariado mostró que el riesgo de infección fue menor en las personas que tenían estudios universitarios (OR=0,10, IC95%: 0,03-0,59) que entre los que no. El riesgo fue mayor entre las personas que consumieron drogas (OR=5,49, IC95%: 1,55-19,43) y entre los que practican la prostitución (OR=6,83, IC95%: 2,52-18,53). En 2006, el riesgo de tener sífilis fue mayor (OR=5,05, IC95%: 1,12-22,72). ConclusionesLa infección por sífilis aumentó sustancialmente entre los HSH. En este grupo, la prevalencia de la infección está relacionada con el nivel educativo, la prostitución y el uso de drogas recreativas no inyectada." ] ] "multimedia" => array:2 [ 0 => array:7 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1896 "Ancho" => 1979 "Tamanyo" => 168911 ] ] "descripcion" => array:1 [ "en" => "Trend in the prevalence (%) of cases of syphilis infection by risky sexual practice in men who have sex with men (MSM) and heterosexuals (HT) first attending the AIDS Information and Prevention Center between 2000 and 2006." ] ] 1 => array:7 [ "identificador" => "tbl0005" "etiqueta" => "Table 1" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "tabla" => array:2 [ "leyenda" => "95%CI: confidence interval at 95%." "tablatextoimagen" => array:1 [ 0 => array:2 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " colspan="2" align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">Univariate model</td><td class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " colspan="2" align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">Multivariate model</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">Odds ratio (95% CI) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">p \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">Odds ratio (95% CI) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">p \t\t\t\t\t\t\n \t\t\t\t</td></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="5" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Educational level</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">No education \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Primary \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.18 (0.04-0.92) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.040 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.18 (0.03 -1.09) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.062 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Secondary \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.19 (0.04 -0.88) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.034 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.21 (0.04-1.12) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.068 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">University \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.08 (0.02-0.42) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.003 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.10 (0.03-.59) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.011 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Unknown \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.23 (0.04 -1.4) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.105 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.24 (0.04-1.61) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.141 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="5" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"></td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="5" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Calendar period</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2000 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2001 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.80 (0.11 -5.68) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.820 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.848 (0.12-6.20) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.871 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2002 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1.27 (0.23 -6.99) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.780 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1.19 (0.21-6.78) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.843 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2003 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">3.58 (0.80-16.12) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.096 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">3.90 (0.84-18.02) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.082 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2004 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">5.15 (1.19-22.25) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.028 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">5.05 (1.12-22.72) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.035 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="5" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"></td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="5" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Drug use</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">No \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Yes \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">4.63 (1.37-15.66) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.014 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">5.49 (1.55-19.43) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.008 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="5" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"></td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="5" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Prostitution</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">No \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Yes \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10.64 (4.22-26.85) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.000 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">6.83 (2.52-18.53) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.000 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="5" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"></td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="5" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HIV</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Negative \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Positive \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">3.34 (1.28-8.71) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.014 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2.06 (0.73-5.82) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.172 \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] "imagenFichero" => array:1 [ 0 => "xTab10960.png" ] ] ] ] "descripcion" => array:1 [ "en" => "Prevalence odds ratio of syphilis in men who have sex with men who underwent voluntary syphilis testing in the AIDS Information and Prevention Center of Valencia from 2000-2004: calendar effect by logistic regression model adjusted by sexual and sociodemographic variables." ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:23 [ 0 => array:3 [ "identificador" => "bib0005" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:1 [ "referenciaCompleta" => "Centers for Desease Control and 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Estadísticas

Original article

Increased syphilis trend among patients in an AIDS information and prevention center

Incremento en la tendencia de sífilis entre los usuarios de un centro de información y prevención del sida

Isabel Hurtadoa,b,

Autor para correspondencia

hurtado_isa@gva.es

Corresponding author.

, Ignacio Alastruec, Menelaos Pavloud, Teresa Tasac, Santiago Pérez-Hoyosa,e

a The Biomedical Research Center Network for Epidemiology and Public Health (CIBERESP), Spain

b Center for Public Health Research (CSIPS), Valencia, Spain

c Valencian Center for AIDS Information and Prevention, Valencia, Spain

d Center for Sexual and HIV Research, London, UK

e Biostatistics Unit, Barcelona Center for International Health Research (CRESIB), Barcelona, Spain

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On the other hand&#44; in the last few years&#44; there has been a relaxation in the use of preventive measures for risky sexual relationships among MSM<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9&#44;10</span></a>&#44; which is also associated with an increase in the use of non-injected recreational drugs such as ecstasy&#44; etc&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a>&#46; Therefore&#44; sexually transmitted infections could be increasing in parallel with an increase in HIV transmission<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a>&#46; In Spain&#44; epidemiological surveillance of sexually transmitted diseases is far from exhaustive&#44; although data can be obtained from both the Notifiable Diseases Surveillance System and the Microbiological Information System&#44; the latter gathering information nationally from a network of laboratories in different regions&#46; Aside from the quality of the surveillance system&#44; a change in the trend from 2003 onwards has been observed&#44; with an increase in syphilis incidence&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">The objective of this study was to describe the trend in syphilis infection in the last few years among persons attending the AIDS Information and Prevention Center &#40;CIPS&#41; in Valencia&#44; Spain&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Subjects and methods</span><p id="par0015" class="elsevierStylePara elsevierViewall">A cross-sectional study was carried out&#44; with all persons making a first visit to the AIDS Information and Prevention Center in Valencia&#44; the third largest city in Spain&#44; from 2000 to 2006 and who reported being at risk of transmission either through HIV infection or by another sexually transmitted diseases such as syphilis&#46; AIDS Information and Prevention Centers are public health centers located in several cities of the autonomous region of Valencia&#44; established by the regional government by the end of 1987&#46; People access these centers either spontaneously or are referred by other health or social centres&#46; These centers provide free&#44; confidential free information and counseling about HIV&#47;AIDS and also carry out serological tests for HIV&#44; hepatitis A&#44; B and C viruses&#44; and syphilis&#46; Before serological testing with blood extraction is performed&#44; a personal face-to-face interview is carried out by health professionals to gather information on different sociodemographic variables and risk practices&#46; Clinic attendees receive pre- and post-test information and counseling on HIV preventive measures&#46; Attendees are also offered vaccination against hepatitis A and B viruses&#46; Persons reporting HIV risk behaviors are invited to attend the center every 6 months&#46; All persons attending the center are tested to determine the presence or absence of antibodies to HIV at distinct visits&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">To determine the presence of HIV antibodies&#44; enzyme immunoanalysis &#40;ELISA&#41; was used&#44; while the Western Blot test was employed to confirm positive results&#46; Indirect diagnostic techniques&#44; based on antibody detection within the patient&#39;s serum&#44; were used for syphilis diagnosis&#46; Firstly&#44; a non-treponemic test of macroscopic flocculation&#44; Rapid Plasma Reagin &#40;RPR&#44; Card Antigen&#44; Becton-Dickinson&#41;&#44; with high sensitivity but low specificity was used&#46; If a positive result of this test was obtained&#44; a treponemic test&#44; Elisa IgG &#40;Treponema screen Liason&#44; Sorin Biomedica&#41; was used to confirm the presence of infection&#46; A case of syphilis was diagnosed when both tests showed a positive result&#46; In cases of discrepancy&#44; a second test was performed&#44; repeating the RPR and using a second treponemal test&#44; FTA-ABS &#40;climb-Spot-IF&#44; BioMerieux&#41;&#46; The antibody titers of the non-treponemic tests were established quantitatively&#44; and a quadruple change in the titer was considered to show a substantial difference between the results of the two tests&#46;&#160;Cases and the percentage of syphilis per year were described according to the characteristics and sexual risk practices of the persons visiting the AIDS Information and Prevention Center during the study period&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">For MSM&#44; there was additional information about sexual practices from 2000 to 2004&#46; Data on sexual activity &#40;receptive and&#47;or insertive anal penetration&#41;&#44; oral sex and the use of condoms in the distinct practices were available&#46; Information on the number of partners within the previous 6 months or during the previous year and on whether attendees had had contact with prostitution was collected&#46; Data on sociodemographic status&#44; educational level and country of origin were also collected&#46; In addition&#44; information was gathered on drug consumption and the way drugs were consumed for heroin&#44; cocaine&#44; cannabis and other substances&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">The calendar effect was assessed by a logistic regression model adjusted for sexual and sociodemographic variables&#46; The presence of an interaction between adjusted variables and calendar period was investigated&#46; Since measurements for subjects differed over time and were not independent&#44; we used a robust estimate for the confidence intervals presented&#46; A likelihood test was used to include variables with a p&#8211;value of 0&#46;05 or less&#46; We used STATA 9&#46;0 for the data analysis&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Results</span><p id="par0035" class="elsevierStylePara elsevierViewall">Among the 10&#44;850 subjects attending the AIDS Information and Prevention Center&#44; the overall prevalence of syphilis was 0&#46;7&#37;&#46; No substantial changes were observed in the study period&#44; except for 2006 when the percentage of subjects with syphilis reached 1&#46;4&#37;&#46; Among persons attending the AIDS Information and Prevention Center&#44; 71&#37; were heterosexuals &#40;HT&#41;&#44; 19&#37; were MSM and 10&#37; were injecting drug users &#40;IDU&#41;&#46; Over the years&#44; the proportion of HT increased from 63&#37; in 2000 to 75&#37; in 2006&#44; implying a reduction in cases among IDU from 19&#37; to 5&#37;&#46; The proportion of MSM was stable for the whole period&#46; HIV coinfection was found in 6&#46;3&#37; of MSM and 2&#46;5&#37; of HT diagnosed with syphilis&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Among MSM&#44; the overall prevalence of syphilis was around 2&#46;4&#37; for the entire period&#46; At the beginning of the study period&#44; the prevalence was around 0&#46;7&#37; and an increase was only observed from 2003&#44; peaking at a prevalence of 4&#46;6&#37; in 2006 &#40;<a class="elsevierStyleCrossRef" href="#fig0005">fig&#46; 1</a>&#41;&#46; The prevalence of syphilis among HT for the whole period was very low with no substantial increases &#40;<a class="elsevierStyleCrossRef" href="#fig0005">fig&#46; 1</a>&#41;&#46; No differences were observed between men and women&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0045" class="elsevierStylePara elsevierViewall">A total of 1&#44;475 MSM attended the center during the study period&#44; but syphilis serology was only available for 1&#44;387&#46; These subjects made a total of 2&#44;360 visits&#46; For all these visits an exhaustive analysis of declared sexual activities and drug use was carried out to assess the association of these practices with infection&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">After fitting a univariate logistic regression model&#44; we observed that the risk of having syphilis was higher for men who practiced prostitution &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>10&#46;64&#59; 95&#37;CI&#58; 4&#46;22-26&#46;85&#41;&#44; as well as for those who reported use of non-injected recreational drugs &#40;ecstasy&#44; methamphetamine&#44; etc&#46;&#41; &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>4&#46;63&#59; 95&#37;CI&#58; 1&#46;37-15&#46;66&#41;&#46; The highest risk was observed for 2004&#46; A lower risk was observed among MSM with high educational level &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0055" class="elsevierStylePara elsevierViewall">The multivariate analysis showed that subjects with a university education had a lower risk of infection &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;10&#59; 95&#37;CI&#58; 0&#46;03-0&#46;59&#41; than those without higher education&#46; However&#44; the risk was higher for those who took drugs other than heroin or cocaine &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>5&#46;49&#59; 95&#37;CI&#58; 1&#46;55-19&#46;43&#41; and those who practiced prostitution &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>6&#46;83&#59; 95&#37; CI&#58; 2&#46;52-18&#46;53&#41;&#46; The highest risk of having syphilis was found in the final year of the study period &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>5&#46;05&#59; 95&#37;CI&#58; 1&#46;12-22&#46;72&#41;&#46; No significant interaction was found between sociodemographic variables and calendar period &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Discussion</span><p id="par0060" class="elsevierStylePara elsevierViewall">Cases of syphilis infection substantially increased among MSM attending the AIDS Information and Prevention Center&#44; especially in recent years&#44; with no major variations in the percentage of MSM who took distinct serological tests&#46; The prevalence of syphilis infection was related to educational level&#44; prostitution and the use of non-injected recreational drugs&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">A similar increase has been identified in several European countries and the USA<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;6&#44;13</span></a>&#46; Moreover&#44; a rise in risky behavior among MSM was evidently related to the use of psychotropic substances and unprotected sexual practices&#44; which may favor the increase in infection<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a>&#46; The rise in syphilis cases in Spain has also been described by a growing trend in the number of cases during the last few years<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a>&#46; An increase in the incidence of syphilis among male homosexuals was detected in a study carried out in a center for sexually transmitted infections in Madrid<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a> and in several studies carried out in Barcelona<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;17</span></a>&#46; The increase in the number of subjects who sought counseling at the AIDS Information and Prevention Center regarding risk practices in their heterosexual relations was not accompanied by an increase in the number of syphilis cases&#44; as occurred in other cities such as Amsterdam<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a>&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Several studies have established associations between sociodemographic variables and the risk of HIV infection among MSM&#46; Men with a low educational level evidently have a greater probability of engaging in risky sexual relations and therefore an increased probability of being infected&#46; However&#44; the relationship between sociodemographic variables and syphilis is less clear&#46; Although we found no significant differences&#44; our data indicated that the number of syphilis cases was greater among men who had not completed primary education&#46; Several studies have shown that the use of drugs&#44; such as meta-amphetamine or designer drugs&#44; increases the probability of having unprotected sexual relations without proper use of condoms and also increases the number of partners<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">14&#44;19&#44;20</span></a>&#46; This behavior has been associated with an increase in the risk of syphilis infection&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">This study has certain limitations related to selection bias among persons attending the AIDS Information and Prevention Center&#44; mainly due to changes in the characteristics of the subjects requesting the services of this center&#46; When established&#44; the center was one of the few places where the HIV test could be carried out anonymously and for free&#46; The AIDS pattern has gradually changed&#44; and the HIV test has been incorporated into the public health system&#46; The AIDS Information and Prevention Center has always been the referral center for most IDU starting a drug use cessation program&#44; as they were referred to the center for HIV testing&#46; Changes in the characteristics of this group are related to changes in the characteristics of the IDU population and therefore selection bias should be relatively small&#46; For other risk practices&#44; changes in the location of the AIDS Information and Prevention Center could account for alterations in the user pattern&#46; However&#44; the center has been at the same place for the last 6 years and therefore an increase in syphilis cases among MSM could not be explained by location changes alone&#46; Moreover&#44; although figures on infection do not reflect the real prevalence or incidence&#44; we believe that the stability and accessibility of this center allowed us to identify trend changes&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">Whether an increase in syphilis cases implies an increase in HIV-infected cases is controversial&#46; A recent study carried out in San Francisco observed that a rise in syphilis cases among MSM was not related to an increase in HIV cases<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a>&#46; In France&#44; Amsterdam and Denmark&#44; the HIV epidemic among MSM remained stable&#44; although an increase in syphilis was observed<a class="elsevierStyleCrossRefs" href="#bib0105"><span class="elsevierStyleSup">21&#44;22</span></a>&#46; However&#44; in Germany&#44; both HIV and syphilis cases increased among MSM in 2003 compared with previous years<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a>&#46; In this case the relationship between HIV infection and the syphilis epidemic was clear&#44; because there was a synergy between the two infections and therefore an increase in the incidence of syphilis may contribute to an increase in HIV transmission<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a>&#46; In Spain&#44; an increase in HIV cases<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a> among MSM was observed in the last few years&#46; According to the HIV Register&#44; the category of homo&#47;bisexual transmission has increased from 26&#46;9&#37; in 2003 to 33&#46;8&#37; in 2005 and to 35&#46;8&#37; in 2006&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">The phenomenon of the increase in syphilis cases and the HIV&#47;AIDS epidemic is not homogeneous&#46; Both local and general plans are required to identify distinct priorities and take decisions that are appropriate to each real-life scenario&#46; The increase observed justifies the need to improve surveillance systems and to accompany these measures with preventive actions so that intervention mechanisms are directed toward the target population in which they will be most effective&#46; For this reason&#44; more active and specific preventive actions should be implemented in venues such as saunas and bars or places where MSM visit to contact possible sexual partners in order to inform this collective about possible hazards and the increase in new infections&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Authorship</span><p id="par0090" class="elsevierStylePara elsevierViewall">I&#46; Hurtado&#44; designed the study&#46; I&#46; Hurtado and S&#46; P&#233;rez-Hoyos carried out the statistical analysis&#46; I&#46; Alastrue and T&#46; Tasa were responsible for data collection&#46; S&#46; P&#233;rez-Hoyos set up the original study and collaborated in its design&#46; I&#46; Hurtado&#44; S&#46; P&#233;rez-Hoyos&#44; M&#46; Pavlou and I&#46; Alastrue recorded and interpreted the results&#46; All of the authors revised the different versions of the manuscript&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Sponsorship</span><p id="par0095" class="elsevierStylePara elsevierViewall">This work was financed by grants from the Conseller&#237;a de Sanitat de la Generalitat Valenciana B12&#47;03 and B15&#47;04&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Conflict of interest</span><p id="par0100" class="elsevierStylePara elsevierViewall">None&#46;</p></span></span>"
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            0 => "Infecci&#243;n por s&#237;filis"
            1 => "Los hombres que tuvieron relaciones sexuales con hombres"
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        "resumen" => "<span class="elsevierStyleSectionTitle">Objective</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">A rebound of syphilis cases has recently been observed&#46; This study describes the trend in syphilis infection among persons attending the AIDS information and prevention center of Valencia&#44; Spain&#46;</p> <span class="elsevierStyleSectionTitle">Methods</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">We performed a cohort study of all persons attended from 2000 to 2006&#46; The calendar effect was assessed by a logistic regression model adjusted by sexual and sociodemographic variables&#46;</p> <span class="elsevierStyleSectionTitle">Results</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">A total of 71&#37; were heterosexuals &#40;HT&#41; and 19&#37; were men who had sex with men &#40;MSM&#41;&#46; Among the 10&#44;850 users of the center&#44; the prevalence of syphilis was 0&#46;7&#37;&#46; Among MSM&#44; the prevalence of syphilis was 2&#46;4&#37; for the whole period and was 4&#46;6&#37; for 2006&#46; Multivariate analysis showed that the risk of infection was lower in persons with a university education &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;10&#59; 95&#37;CI&#58; 0&#46;03-0&#46;59&#41; than in those without&#46; The risk was higher in persons who took drugs &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>5&#46;49&#59; 95&#37;CI&#58; 1&#46;55-19&#46;43&#41; or who practiced prostitution &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>6&#46;83&#59; 95&#37;CI&#58; 2&#46;52-18&#46;53&#41;&#46; In 2006&#44; the risk of having syphilis was greater &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>5&#46;05&#59; 95&#37;CI&#58; 1&#46;12-22&#46;72&#41;&#46;</p> <span class="elsevierStyleSectionTitle">Conclusions</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Syphilis infection increased substantially among MSM&#46; In this collective&#44; the prevalence of infection is related to educational level&#44; prostitution and the use of non-injected recreational drugs&#46;</p>"
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        "resumen" => "<span class="elsevierStyleSectionTitle">Objetivo</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">En los &#250;ltimos a&#241;os se ha observado un repunte en los casos de s&#237;filis&#46; Este estudio describe la evoluci&#243;n de la infecci&#243;n por s&#237;filis entre las personas que asistieron a un centro de informaci&#243;n y prevenci&#243;n del sida de Valencia&#44; Espa&#241;a&#46;</p> <span class="elsevierStyleSectionTitle">M&#233;todos</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Se realiz&#243; un estudio de cohorte de todas las personas atendidas entre 2000 y 2006&#46; El efecto calendario se evalu&#243; mediante un modelo de regresi&#243;n log&#237;stica ajustando por variables sociodemogr&#225;ficas y sexuales&#46;</p> <span class="elsevierStyleSectionTitle">Resultados</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">El 71&#37; de los que acudieron al centro eran heterosexuales y el 19&#37; eran hombres que ten&#237;an sexo con hombres &#40;HSH&#41;&#46; Entre los 10&#46;850 individuos&#44; la prevalencia de la s&#237;filis fue del 0&#44;7&#37;&#46; Entre los HSH&#44; la prevalencia de la s&#237;filis fue del 2&#44;4&#37; para todo el per&#237;odo y del 4&#44;6&#37; para 2006&#46; El an&#225;lisis multivariado mostr&#243; que el riesgo de infecci&#243;n fue menor en las personas que ten&#237;an estudios universitarios &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;10&#44; IC95&#37;&#58; 0&#44;03-0&#44;59&#41; que entre los que no&#46; El riesgo fue mayor entre las personas que consumieron drogas &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>5&#44;49&#44; IC95&#37;&#58; 1&#44;55-19&#44;43&#41; y entre los que practican la prostituci&#243;n &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>6&#44;83&#44; IC95&#37;&#58; 2&#44;52-18&#44;53&#41;&#46; En 2006&#44; el riesgo de tener s&#237;filis fue mayor &#40;OR<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>5&#44;05&#44; IC95&#37;&#58; 1&#44;12-22&#44;72&#41;&#46;</p> <span class="elsevierStyleSectionTitle">Conclusiones</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">La infecci&#243;n por s&#237;filis aument&#243; sustancialmente entre los HSH&#46; En este grupo&#44; la prevalencia de la infecci&#243;n est&#225; relacionada con el nivel educativo&#44; la prostituci&#243;n y el uso de drogas recreativas no inyectada&#46;</p>"
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Primary&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;18 &#40;0&#46;04-0&#46;92&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;040&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;18 &#40;0&#46;03 -1&#46;09&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;062&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Secondary&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;19 &#40;0&#46;04 -0&#46;88&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;034&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;21 &#40;0&#46;04-1&#46;12&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;068&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>University&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;08 &#40;0&#46;02-0&#46;42&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;003&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;10 &#40;0&#46;03-&#46;59&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;011&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Unknown&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;23 &#40;0&#46;04 -1&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;105&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;24 &#40;0&#46;04-1&#46;61&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;141&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="5" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="5" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleItalic">Calendar period</span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>2000&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>2001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;80 &#40;0&#46;11 -5&#46;68&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;820&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;848 &#40;0&#46;12-6&#46;20&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;871&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>2002&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&#46;27 &#40;0&#46;23 -6&#46;99&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;780&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&#46;19 &#40;0&#46;21-6&#46;78&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;843&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>2003&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">3&#46;58 &#40;0&#46;80-16&#46;12&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;096&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">3&#46;90 &#40;0&#46;84-18&#46;02&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;082&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>2004&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&#46;15 &#40;1&#46;19-22&#46;25&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;028&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&#46;05 &#40;1&#46;12-22&#46;72&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;035&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="5" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="5" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleItalic">Drug use</span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>No&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Yes&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">4&#46;63 &#40;1&#46;37-15&#46;66&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;014&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&#46;49 &#40;1&#46;55-19&#46;43&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;008&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="5" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="5" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleItalic">Prostitution</span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>No&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Yes&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">10&#46;64 &#40;4&#46;22-26&#46;85&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;000&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">6&#46;83 &#40;2&#46;52-18&#46;53&#41;&nbsp;\t\t\t\t\t\t\n
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Información del artículo

ISSN: 02139111
Idioma original: Inglés

DOI:10.1016/j.gaceta.2010.04.007

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