AS many as 28 pc of South African schoolgirls HIV positive As many as 28 percent of South African schoolgirls are HIV positive, according to figures from the country's health minister reported by local media on Thursday. REFILE of a story shot in July 2012. South African scientists are testing a vaginal ring to prevent women from contracting HIV. The aim is to give women tools to avoid infection, in a country where men often refuse to practice safe sex. A natural sound version of an AFPTV report