HIV Prevalence and Incidence in a Cohort of Women at Higher Risk for HIV Acquisition in Chókwè, Southern Mozambique

BACKGROUND: Reliable HIV incidence estimates for Mozambique are limited. We conducted a prospective HIV incidence study as part of a clinical research site development initiative in Chokwe district Gaza Province southern Mozambique. METHODS: Between June 2010 and October 2012 we recruited women at sites where women at higher risk of HIV infection would likely be found. We enrolled and tested 1429 sexually active women in the screening phase and 479 uninfected women in the prospective phase. Participants were scheduled for 12+ months follow-up when they underwent face-to-face interviews HIV counseling and testing and pregnancy testing. We observed a total of 373.1 woman-years (WY) of follow-up with mean (median) of 9.4 (9.7) women-months per participant. RESULTS: The prevalence of HIV was 29.4% (95% confidence interval [CI]: 27.0-31.8%). In multivariable logistic regression analysis factors that remained significantly associated with prevalent HIV were: older age (OR: 0.6; 95% CI: 0.4-0.7) lower educational level (OR: 0.4; 95% CI: 0.3-0.7) and using hormonal contraception (OR: 0.6; 95% CI: 0.4-0.7) or condoms (OR: 0.5; 95% CI: 0.3-0.7). We observed an HIV incidence rate of 4.6 per 100 WY (95% CI: 2.7 7.3). The HIV incidence was 4.8 per 100 WY (95% CI: 2.5 8.3) in women aged 18-24 years 4.5 per 100 WY (95% CI: 1.2 11.4) in women aged 25-29 years and 3.2 per 100 WY (95% CI: 0.1 18.0) in the 30-35 years stratum. None of the demographic factors or time-varying behavioral factors examined was significantly associated with incident HIV infection in bivariable analysis at p multiple sexual partners.