title: Sexually transmitted infections in female sex workers in five border provinces of Vietnam.
abstract: BACKGROUND
  Although high prevalences of sexually transmitted infections (STIs) have been reported among female sex workers (FSWs) in some countries of Asia, there is little data about this issue in Vietnam.
  
  
  OBJECTIVE
  The goal of this study was to determine 1) the prevalence of selected STIs and correlates of chlamydia or gonococcal infection, and 2) contraceptive practices, STI-related symptoms, and healthcare-seeking behavior in FSWs in border provinces of Vietnam.
  
  
  METHODS
  Nine hundred eleven FSWs in five border provinces of Vietnam (Lai Chau, Quang Tri, Dong Thap, An Giang, and Kien Giang) were enrolled in a cross-sectional study between December 2002 and January 2003. Study subjects were interviewed about selected sociodemographic and behavioral characteristics, history of STIs, and information about cohabiting partners by a standard interview schedule. Serologic samples were collected for syphilis and urine specimens for gonorrhea and chlamydia. Univariate and multivariate logistic regression analysis was used to determine behavioral and other selected risk factors for gonorrhea/chlamydia among FSWs.
  
  
  RESULTS
  Overall, the prevalences of syphilis, gonorrhea, chlamydia, and gonorrhea/chlamydia among FSWs in the five border provinces were 10.7%, 10.7%, 11.9%, and 19.9%, respectively. The prevalence of gonorrhea/chlamydia was higher in the northern and central regions (27-33%) than in the southern region (11-24%). The prevalence of syphilis was low in Lai Chau (1%), but higher than 10% in the other four border provinces. Among FSWs with cohabiting partners, income < or =33 US$ per month (odds ratio [OR] = 5.8, P = 0.009), ever having worked outside Vietnam (OR = 78.2, P = 0.007), partner's age <30 years (OR = 11.7, P = 0.001), and partner's complaint of burning or pain during sex (OR = 15.6, P = 0.02) were significantly associated with gonorrhea/chlamydia. Among single FSWs, sex work <6 months (OR = 2.6, P <0.001) and ever douching in the last month (OR = 1.7, P = 0.026) were associated with gonorrhea/chlamydia. For all FSWs, a complaint of lower abdominal pain (OR = 1.6, P = 0.028) and sex work <6 months (OR = 2.3, P = 0.001) were significantly associated with gonorrhea/chlamydia.
  
  
  CONCLUSIONS
  There is a high prevalence of gonorrhea/chlamydia among FSWs in these border provinces of Vietnam. Correlates of gonorrhea/chlamydia identified in this study could be incorporated into treatment algorithms for cervicitis in FSWs in Vietnam.
authors.affiliation: Pasteur Institute, Ho Chi Minh City, Vietnam.
authors.forename: Vu Thuong
authors.initials: VT
authors.lastname: Nguyen
authors.forename: Thanh Long
authors.initials: TL
authors.lastname: Nguyen
authors.forename: Duy Hung
authors.initials: DH
authors.lastname: Nguyen
authors.forename: Thi Thanh Truc
authors.initials: TT
authors.lastname: Le
authors.forename: Thi Tuyet Nhung
authors.initials: TT
authors.lastname: Vo
authors.forename: Thi Bao Van
authors.initials: TB
authors.lastname: Cao
authors.forename: Nigel
authors.initials: N
authors.lastname: O'Farrell
mesh_terms: D000293:Adolescent; D000328:Adult; D002690:Chlamydia Infections / Q000453:epidemiology; D003430:Cross-Sectional Studies; D005260:Female; D006069:Gonorrhea / Q000453:epidemiology; D006801:Humans; D015995:Prevalence; D012424:Rural Population; D011477:Sex Work; D012749:Sexually Transmitted Diseases / Q000453:epidemiology; D015231:Sexually Transmitted Diseases, Bacterial / Q000453:epidemiology*; D011795:Surveys and Questionnaires; D013587:Syphilis / Q000453:epidemiology; D014744:Vietnam