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Objectives: To analyze and understand the risk factors related to HIV new infections among men who have sex with men (MSM). Methods: A longitudinal observational study among MSM was conducted to collect information on HIV related behaviors and sero-conversion. Univariate and multivariate generalized estimating equations (GEE) were used to discuss the risk factors for HIV new infection. Results: A total number of 4 305 MSM were followed during 2013-2015. Among those self-reported MSM who are seeking partners on the Interner tended to have higher proportion on receptive anal intercourse and consistent condom use during anal intercourse than the subgroups seeking their partners in gay bars or bathrooms. HIV incidence among followed MSM during the study period appeared as 4.3/100 person years, with adjusted RR (aRR) of HIV infection for receptive anal intercourse as group 2.20 (95% CI: 1.49-3.24) times than that of insertion anal intercourse group. Those who used rush-poppers (aRR=1.55, 95% CI: 1.10-2.17), unprotected anal intercourse (aRR=2.24, 95%CI: 1.62-3.08), and those with syphilis infection (aRR=2.95, 95%CI: 2.00-4.35) were also risk factors for HIV new infections. After controlling other factors, the relationship between the ways of seeking partners and HIV new infection was not statistical significant. Conclusion: Risk factors for HIV new infection among MSM appeared complex and interactive, suggesting that further studies are needed to generate tailored strategies for the prevention of HIV epidemic among MSM population.

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Objective To study the outcomes of AIDS intervention programs and to provide scientific evidence for developing pertinent strategy on intervention among men who have sex with men (MSM).Methods MSM were recruited through snowballing and investigated by face to face interview in 2006 and 2007 respectively.SPSS 12.0 was used to compare the change of cognition about AIDS,sexual behavior,prevalence rates of HIV and Syphilis before and after the intervention program among the population under study.Results The cognition about AIDS among MSM was obviously improved after the intervention with the rate increased from 74.3% to 82.4% (P=0.01).The rate of last time condom use among MSM increased from 56.4% to 65.5% (P=0.00).The rate of consistent condom use during six months among MSM increased from 31.8% to 41.9% (P=0.00).The rates of both condom use during commercial sex with men and with women did not change much among MSM.The prevalence rates of HIV in 2006 and 2007 were 10.4% and 10.8% and of syphilis in 2006 and 2007 were 9.3% and 7.3% respectively which were not significantly different between before and after the intervention.Conclusion The cognition about AIDS among MSM was improved obviously.However,the rate of consistent condom use was still low,reflecting the segregation phenomenon between their behavior and cognition.All our findings implied that it was crucial to carry out AIDS prevention and control programs.

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<p><b>OBJECTIVE</b>To examine HIV prevalence and its associated factors among men who have sex with men (MSM) and provide the evidence for the intervention program among MSM.</p><p><b>METHODS</b>A face-to-face questionnaire interview was conducted among MSM recruited by snowball sampling method in Yuzhong, Jiulongpo and Shapingba district of Chongqing from July to September, 2007. Totally, 1044 MSM were recruited. Associated factors with HIV prevalence were analyzed using forward stepwise logistic regression that HIV status was the dependent variable and demographics, AIDS awareness, sexual behaviors and the status of the intervention were independent variables.</p><p><b>RESULTS</b>A total of 1044 MSM were surveyed. The rate of AIDS awareness was 89.5% among MSM. The rate of unprotected anal sex during the past 6 months was 63.8%. The prevalence of HIV and syphilis was 8.5% (89/1044) and 12.5% (131/1044) respectively. The multivariate analysis identified that the older MSM (OR = 1.69, 95% CI: 1.13 - 2.52), junior school education (OR = 1.89, 95% CI: 1.17 - 3.05), younger than 18 years old of the first sex (OR = 3.11, 95% CI: 1.20 - 8.02), more than 10 sexual partners (OR = 2.24, 95% CI: 1.24 - 4.02), the history of having sex with women (OR = 2.40, 95% CI: 1.64 - 3.51) and syphilis infection (OR = 4.52, 95% CI: 2.77 - 7.38) were independent risk factors associated with HIV infection.</p><p><b>CONCLUSION</b>The rate of unprotected anal sex was high, so were the prevalence of HIV and syphilis among MSM. It should be urgent to conduct the intervention to stop AIDS rapid transmission among MSM.</p>

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