In Vulindlela, the winter grass is yellow and an icy wind blows off the white-coated Drakensberg. But in the small collection of park homes that make up the local clinic and research site, there is warmth in people'€™s faces and voices.

In one of the biggest advances in HIV prevention in decades, a vaginal gel containing an antiretroviral drug has been proven to protect almost four out of 10 women from HIV.