Cohort study on the influential factors of HIV infection among men who have sex with men in Liuzhou City

Objective To understand the prevalence and influential factors of human immune deficiency virus(HIV)infection among men who have sex with men(MSM) in Liuzhou City, so as to provide the evidence for HIV prevention and control. Methods Snowball sampling method was used to set up MSM cohort in the urban area of Liuzhou from June 2014, and they were followed up each six months. Blood samples were taken from these MSM to detect antibodies of HIV. Results Baseline and three followers were recruited for 1 369 MSM. We successively completed the first follow-up (158 cases), the second follow-up (126 cases), and the third follow-up (74 cases). MSMs' knowledge of HIV/AIDS increaseed with the rise as the number of follow-up(χ²=7.698,P=0.006).Condom usage in the latest commercial anal sex (χ²=7.510,P=0.006) and anal same-sex sexual behavior (χ²=5.005,P=0.025) were in rising trend. Multifactorial Cox regression analysis showed that higher scores of HIV/AIDS related knowledge(OR=0.119,95% CI:0.021-0.686,P=0.017)and less drug use in the last 6 months (OR=0.036,95% CI:0.006-0.212,P<0.001), the risk of HIV infections was lower. Conclusions It is important to strengthen AIDS knowledge propaganda among MSM, raise the rate of AIDS related knowledge and the frequency of using comdom, reduce the drug use in order to curb the spread of AIDS in the MSM.