Scientists say a long-acting, experimental drug completely protected monkeys from infection in two studies reported at an Aids conference in Boston.
Read: Transmission of HIV
If testing in people shows the same, the shots could become a new tool to curb the spread of HIV. There's already a daily pill that can be taken by those who don't have the virus but are at risk of getting it from an infected partner.
The studies were done by the Centres for Disease Control and Prevention and researchers at Rockefeller University in New York.