HIV prevalence is high in key populations in both the mainland and in Zanzibar.
Adult HIV prevalence on the mainland reduced significantly although this reduction has occurred mainly among men. Njombe region has a high prevalence with 14.8 per cent, while Dar es Salaam and Mbeya shoulder an estimated one third of the total number of adult people living with HIV.
The epidemic among teens aged 15–19 years has remained stable since 2008, with no decline in adolescent HIV prevalence. Tanzania carries 5 per cent of the global burden of HIV among adolescents.
Girls are disproportionately affected and are almost three times more likely to be living with HIV than boys of the same age. Early marriage and childbearing are common – 27 per cent of girls aged 15–19 years are either pregnant or have had a child.
The HIV epidemic shows strong regional variation, with children, adolescents, women and key populations continuing to be disproportionately affected. Mainland Tanzania has a generalized epidemic, while in Zanzibar, HIV prevalence is concentrated among key populations.