Population-based study of HIV-1 infection in 4,086 subjects in northwest Tanzania.

A population-based HIV-1 seroprevalence survey of 4,086 individuals, aged 15-49 years, in the North Mara district of Tanzania from rural, periurban, and urban areas, including high-risk (prostitutes, and co-workers) individuals, was performed in 1989 and 1990. The overall seroprevalence was 7.3% (95% confidence interval, 6.