Objective To investigate serologic screening for sexually transmitted infections (STI) in men who have sex with men (MSM) and provide evidence for intervention in the population. Methods A questionnaire investigation was conducted in MSM. Serologic specimens were taken to detect antibodies to HIV, syphilis, herpes simplex virus (HSV)-2, hepatitis C virus, and hepatitis E virus, as well as HBsAg. Results A total of 138 MSM were screened. HIV antibody was negative in all of them. TPPA was reactive in 23 (16.7%) men, among which RPR was positive in 10 (7.2%). The antibodies to HSV-2-IgG, hepatitis C virus, and hepatitis E virus, and HBsAg were found in 7.8%, 0, 16.1% and 9.7% of the men, respectively. Conclusions STIs are identified in this group of MSM. It is important to provide preventive intervention for this population.

ObjectiveTomonitorthehighriskbehaviorsandotherAIDS/STIrelatedfactorsamongmenwhohavesexwithmen(MSM),especiallymalehomosexualsinmainlandChina.MethodsSelf-administratedanonymousmailsurveyswerecarriedoutin2001,andanalyzedwithSPSS.ResultsOnethousandonehundredandnineeffectivequestionnaireswerecollectedfrom30provincesandcities.MostofMSMlivedinbigormedi-um-sizedcities,havinggoodeducation,andbeingyounger.Thenumbersofsamegendersexpartnersweremorethanone.Theyoftenhadcasualsexpartnersandunprotectedintercourse.Inthelastyear,11.45%reportedhavingbeendiagnosedSTI.AmongMSMwhohavebeentestedforHIVantibody,5.45%oftestswerepositive.ConclusionsWhileSTIratehasbeenreachingahighlevel,MSMwithSTIalsohavebeeninfectedwithHIVintheMSMofmainlandChina.OthergroupshavingsexwithMSMareatgreaterriskofSTI/HIVinfection.ItisinurgentneedtopreventandcontrolSTI/AIDSinMSM.

Objectives To investigate the infection and colonization of Mycoplasma genitalium and Ureaplasma urealyticum in different male populations, to explore the association of M. genitalium and U. urealyticum with nongonococcal urethritis (NGU) respectively. Methods A case-controlled, cross sectional study of four different male populations was performed, namely: NGU patients (G1), non-NGU subjects attending STD clinic (G2), men who had sex with men participating in a health education program (G3), and healthy volunteers (G4). Nested PCR and culture were used to detect U. urealyticum. Nested PCR and PCR product sequencing were applied to detect M. genitalium. Results The prevalence rates of M. genitalium in the four study populations were 25.0%(25/100), 6.4%(6/94), 5.5%(6/110) and 0% respectively. Significant difference was found between each two groups except G2～G3 with a p value of 0.80. By multivariate regression analysis, controlling for the age of first sex, new sexual partners, urethritis and condom use in the previous 3 months, M. genitalium was only associated with urethritis (P= 0.004, OR = 6.754, 95% CI 1.833～24.893). The direct sequencing of PCR products showed gene mutations, in comparison with the reference sequence in GenBank, in 3 samples. The prevalence rates of U. urealyticum by PCR in 4 groups were 40.0%, 44.7%, 22.7% and 46.9% respectively, and there was no significant difference between G1～G2, G1～G4 or G2～G4 with a p value of 0.419, 0.325, 0.868 respectively, but the prevalence rate of U. urealyticum in G3 was significantly lower than that in other groups. Conclusions M. genitalium is strongly associated with NGU and the prevalence rate is significantly higher in groups with high risk sexual behaviors than that in general population. There is no association between the colonization of U. urealyticum and NGU.

Objective To estimate the prevalence of sexually transmitted diseases(STDs) among men who have sex with men (MSM) in some cities of Jiangsu province.Methods A cross-sectional questionnaire survey was carried out among MSM attending gay bars in some cities of Jiangsu province.Participants underwent screening for STDs in accordance with their personal wishes.Urethral swabs,first void urine and blood samples were collected at these survey sites and delivered to the STD research laboratory for testing.Univariate analysis and multivariate logistic regression analysis were performed to assess factors associated with STDs.Results A total of 388 subjects completed the questionnaire and underwent physical examination and STD screening.Of these subjects,45.6％ had only homosexual behavior.Examination of urine or urethral swab specimens showed that the prevalence rate was 1.3％ (5/388),9.4％ (36/385),17.2％ (66/384) and 28.1％ (109/388) for Neisseda gonorrhoeae,Chlamydia trachomatis,Mycoplasma genitalium and Ureaplasma urealyticum infection respectively.Serological tests revealed that the positivity rate was 1.0％ (4/388) for anti-human immunodeficiency virus (HIV)antibody,18.8％(73/388) for Treponema pallidum particle agglutination assay (TPPA),12.1％(47/388) for rapid plasma reagin (RPR) test,9.8％ (38/388) for human herpes simplex virus (HSV)-2-IgG,9.8％ (38/388) for hepatitis B surface antigen,1.0％ (4/388) for anti-hepatitis C virus antibody and 2.1％ (8/388) for anti-hepatitis E virus antibody.Multivariate analysis indicated that Chlamydia trachomatis infection was independently and significantly associated with polymorphonuclear leucocyte (PMNL) counts in urethral swab smears (adjusted odds ratio (AOR):5.30,95％ CI:2.04-13.77,P ＜ 0.01),Mycoplasma genitalium infection was significantly associated with age (AOR:2.84,95％ CI:1.17-6.87,P＜ 0.05),PMNL counts in urethral swab smears (AOR:2.37,95％ CI:1.01-557,P＜ 0.05) and urethral discomfort in the past three months (AOR:2.43,95％ CI.1.18-5.02,P＜ 0.05),and syphilis (defined as a positive TPPA and RPR test) was associated with age (AOR:2.46,95％ CI:1.05-5.75,P ＜ 0.05) and seropositivity for anti-HSV-2 antibodies (AOR:3.70,95％ CI:1.62-8.44,P ＜ 0.01).Conclusions There is a high prevalence of STDs among MSM attending gay bars in some cities of Jiangsu province,with Chlamydia trachomatis and Mycoplasma genitalium as the most common pathogens of urethritis.