Objective  To understand the prevalence of HIV and syphilis

and the estimated HIV incidence among young male students who have sex with men in order to provide the suggestion for intervention.   Methods  The data of the cross-sectional survey conducted from 2006 to 2009 were analyzed and compared the trend of HIV

syphilis prevalence and estimated HIV incidence from 2006 to 2009 among young male students who have sex with men. Estimated HIV incidence =Number HIV infections/sum of (current age age at start of anal intercourse).   Results  A total of 210

206

181 and 190 young male students who have sex with men were investigated in the year of 2006

2007

2008 and 2009 respectively. The rate of condom used when having sex with men in the last time was increased from 48.0% in 2006 to 64.3% in 2009. The proportion of unprotected anal sex with men was decreased from 71.1% in 2006 to 65.3% in 2009. HIV prevalence was 4.3%

3.9%

11.0% and 11.1% respectively from 2006 to 2009. Syphilis prevalence was 7.1%

3.9%

2.8% and 5.8% for these consecutive 4 years respectively. Estimated HIV incidence among young male students who have sex with men (22 years old and younger) was 1.4%

0.9%

2.4% and 2.5% respectively for these years.   Conclusion  HIV prevalence is high and its trend is advancing year by year among young male students

so is the estimated HIV incidence. HIV epidemics is serious in Chongqing. It is quite urgent to conduct the comprehensive intervention in such cohort.