Lenacapavir is an antiretroviral medicine that helps prevent 99.9 per cent of all HIV transmission, according to studies.

The United States Food and Drug Administration (FDA) has approved a twice-a-year drug to be used to prevent HIV.

The approval could slow new infections and move the world closer to eliminating HIV. But huge obstacles remain.

Cuts to federal research funding may delay a potential hepatitis B cure, as trials led by UCSF progress. Asian Americans ...