Dynamic analysis of prevalence of AIDS and high risk behaviors among men who have sex with men in Ningbo, 2010-2012

Objective To understand the prevalence of AIDS and high risk behaviors among men who have sex with men (MSM) in Ningbo, and provide scientific evidence for the development of effective prevention and control strategy. Methods Face to face interview was conducted among MSM recruited through "snowball" sampling from 2010 to 2012, and blood samples were taken form them to conduct HIV and syphilis test. Results From 2010 to 2012, 404, 435 and 414 MSM were surveyed each year. The awareness rate of AIDS related knowledge among the MSM increased with year. Totally 64.6%-75.1% of the MSM used condemns at the latest homosexual activities and 35.4%-42.6% of them used condoms at each homosexual activities in the past six months. Less than 50% of the MSM used condemns at the latest heterosexual activities and less than 30% of them used condoms at each heterosexual activities in the past six months. From 2010 to 2012, the annual infection rate of HIV was 8.9%, 9.0% and 8.2%, respectively, and there were no significant differences in 3 year infection rates. Conclusion The infection rate of HIV among MSM was comparative high without obvious increase in Ningbo. Therefore, it is very important to strengthen dynamic surveillance and health education, and improve intervention in this population.