Truvada 'can greatly reduce risk of HIV infection'

A drug used to treat HIV-positive patients may offer gay and bisexual men some protection against contracting the virus, the authors of a new study say.

Trials of the combination drug Truvada among nearly 2,500 men suggested it could reduce the chances of male-to-male HIV infection by 44%.

Those using the drug regularly could further reduce the risk of infection, it was claimed.