The world's governments need to "step up on prevention" of AIDS-related illnesses, says Winnie Byanyima, the head of UNAIDS. "Don't focus just on treatment," says Byanyima at an event in Johannesburg to mark the launch of the UN agency's annual Global Aids report which highlights how major cuts to foreign aid, especially by the US, have triggered a funding crisis which could reverse decades of hard-fought gains in the fight against AIDS. IMAGES AND SOUNDBITES