RT Journal Article SR Electronic T1 HIV-1 and other sexually transmitted infections in a cohort of female sex workers in Chiang Rai, Thailand. JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 30 OP 35 DO 10.1136/sti.75.1.30 VO 75 IS 1 A1 Limpakarnjanarat, K A1 Mastro, T D A1 Saisorn, S A1 Uthaivoravit, W A1 Kaewkungwal, J A1 Korattana, S A1 Young, N L A1 Morse, S A A1 Schmid, D S A1 Weniger, B G A1 Nieburg, P YR 1999 UL http://sti.bmj.com/content/75/1/30.abstract AB OBJECTIVES: To determine demographic and behavioural factors and sexually transmitted infections (STIs) associated with prevalent HIV-1 infection among brothel based and other female sex workers (FSWs) in Chiang Rai, northern Thailand. METHODS: Data were collected from questionnaires, physical examinations, and laboratory evaluations on Thai FSWs enrolled in a prospective cohort study in Chiang Rai, Thailand, from 1991 to the end of 1994. RESULTS: HIV-1 seroprevalence was 32% among 500 women: 47% for 280 brothel workers and 13% for 220 other FSWs (p < 0.001); 96% of infections were due to HIV-1 subtype E. At enrolment, other STIs were common: chlamydia, 20%; gonorrhoea, 15%; active syphilis (serological diagnosis), 9%; genital ulcer, 12%; seroreactivity to Haemophilus ducreyi, 21%, and herpes simplex virus type 2 (HSV-2), 76%. On multiple logistic regression analysis, HIV-1 was associated with brothel work, birth in upper northern Thailand, initiation of commercial sex at < 15 years of age, syphilis, HSV-2 seropositivity, and genital ulcer. CONCLUSIONS: Young Thai FSWs working in brothels in northern Thailand in the early phase of the HIV epidemic have been at very high risk for HIV-1 infection and several other STIs. Programmes are needed to prevent girls and young women from entering the sex industry and to reduce the risk of infection with HIV-1 and other STIs.