title: Estimation of population-size changes and HIV prevalence among female sex workers from 2006 to 2009 in Kaiyuan, Yunnan, China.
abstract: OBJECTIVE
  This study is to estimate the population size and prevalence of HIV and herpes simplex virus type 2 (HSV-2) infections among female sex workers (FSWs) in Kaiyuan, Yunnan Province, China.
  
  
  METHODS
  Eight cross-sectional studies were conducted among FSWs in Kaiyuan from 2006 to 2009. Based on the data from two study time points each year, the total numbers of FSWs and HIV positive FSWs were estimated by using the capture-recapture technique (CR).
  
  
  RESULTS
  Estimated sizes of FSWs in Kaiyuan were 1 629, 1 672, 1 186, and 1 014 in the respective years from 2006 to 2009. Although the crude prevalence rates of HIV and HSV-2 varied over time, the adjusted prevalence among this population was relatively stable at 10%-12% and the adjusted HSV-2 prevalence ranged from 67% to72%.
  
  
  CONCLUSIONS
  The reason for the slight decrease of the size of the FSW population is unknown. The adjusted prevalence rates of HIV and HSV-2 among them were stable over the course of this study.
authors.affiliation: National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.
authors.forename: Jun Jie
authors.initials: JJ
authors.lastname: Wang
authors.forename: Qian
authors.initials: Q
authors.lastname: Yang
authors.forename: Pan Ying
authors.initials: PY
authors.lastname: Fan
authors.forename: Kathleen H
authors.initials: KH
authors.lastname: Reilly
authors.forename: Guo Wei
authors.initials: GW
authors.lastname: Ding
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D002681:China / Q000453:epidemiology; D003430:Cross-Sectional Studies; D005260:Female; D015658:HIV Infections / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D060386:Sex Workers / Q000706:statistics & numerical data; D055815:Young Adult