[Surveillance on HIV-1 incidence among men who have sex with men in Chongqing, China, 2006 - 2008].

Objective: To estimate HIV-1 incidence among men who have sex with men (MSM) in Chongqing and to provide reasonable evidence for intervention strategy.

Methods: Using "snowballing" and convenient sampling, 2989 MSM were recruited during 2006 - 2008. BED-CEIA was applied to the leftover blood samples to estimate the crude and adjusted HIV-1 incidence rates. Incidence was stratified by venues and age groups.

Results: The incidence among MSM in Chongqing were 7.01%, 7.98% and 7.80% from 2006 - 2008 respectively with statistically significant differences by venues. The highest incidence was found among those who frequently visiting public baths/sauna and those MSM who find sex partners through internet, amounting to 17.87% and 12.22% respectively in 2007 and 2008. The 21 - 25 year-old group had the highest incidence in 2008, reaching 8.69%. Various adjustments brought down the estimated incidence across the three years.

Conclusion: HIV-1 incidence among MSM maintained at a high level across the three years but without an increasing trend.