title: HIV incidence among men who have sex with men in Beijing: a prospective cohort study.
abstract: OBJECTIVE
  (1) To assess the HIV incidence rate among men who have sex with men (MSM) in a large cohort study in Beijing, China and (2) to identify sociodemographic and behavioural risk factors of HIV seroconversion among MSM in Beijing, China.
  
  
  METHODS
  A prospective cohort study.
  
  
  METHODS
  Baseline and follow-up visits were conducted among MSM in Beijing, China.
  
  
  METHODS
  A cohort of 797 HIV-seronegative MSM was recruited from August to December 2009, with follow-up occurring after 6 and 12 months.
  
  
  METHODS
  At baseline and follow-up visits, participants reported sociodemographic and sexual behaviour information, and were tested for HIV, herpes simplex virus-2 (HSV-2) and syphilis with whole blood specimens. Cox regression analysis was used to identify factors associated with HIV seroconversion.
  
  
  RESULTS
  Most study participants (86.8%) were retained by the 12-month follow-up. The HIV, HSV-2 and syphilis incidence rates were 8.09 (95% CI 6.92 to 9.26), 5.92 (95% CI 5.44 to 6.40) and 8.06 (95% CI 7.56 to 8.56) cases per 100 person-years, respectively. HIV seroconversion was significantly associated with being <25 years old, having <12 years of education, having >1 male sex partner in the past 6 months, and being syphilis positive or HSV-2 positive.
  
  
  CONCLUSIONS
  The HIV incidence among MSM in Beijing is serious. Interventions and treatment of sexually transmitted diseases (STD) should be combined with HIV control and prevention measures among MSM.
authors.affiliation: Chaoyang Center for Disease Control and Prevention, Beijing,  PR China.
authors.forename: Dongliang
authors.initials: D
authors.lastname: Li
authors.forename: Shuming
authors.initials: S
authors.lastname: Li
authors.forename: Yingjie
authors.initials: Y
authors.lastname: Liu
authors.forename: Yanjie
authors.initials: Y
authors.lastname: Gao
authors.forename: Mingrun
authors.initials: M
authors.lastname: Yu
authors.forename: Xueying
authors.initials: X
authors.lastname: Yang
authors.forename: Qingchun
authors.initials: Q
authors.lastname: Li
authors.forename: Shulin
authors.initials: S
authors.lastname: Jiang
authors.forename: Zhenhai
authors.initials: Z
authors.lastname: Zhou
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Yan
authors.forename: Guiyan
authors.initials: G
authors.lastname: Jiang
authors.forename: Dong
authors.initials: D
authors.lastname: Xiao
authors.forename: Stephen W
authors.initials: SW
authors.lastname: Pan
authors.forename: Fengji
authors.initials: F
authors.lastname: Luo
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Ruan
authors.forename: Yiming
authors.initials: Y
authors.lastname: Shao