On-demand, or 2-1-1, PrEP requires taking only four doses of Truvada during the days surrounding sex.

Researchers provided an initial Truvada prescription to eligible gay and bi men and trans women at their first appointment.

Researchers analyzed data from 42 HIV centers in 11 Latin American nations.

Help find the “missing millions” who don’t know they’re living with viral hepatitis.

But official immigration policy states that HIV “is no longer defined as a communicable disease of public health significance.”

A guest blog post by Andrew Ngo, age 18.

A report maps out four common factors that help these cities and countries beat the epidemic. [VIDEO]

Among nearly 10,000 gay and bisexual men followed for a cumulative 18,000 years, there have been only 16 new cases of the virus.

The vaccine in the APPROACH study, which led to the Imbokodo and forthcoming Mosaico trails, prompted a robust immune response.

Poised for regulatory approval, the monthly vaginal ring appeared to lower the risk of HIV by about 39% overall in a recent study.