A Doctors Without Borders counselor tests a South African woman for HIV. Jason Beaubien/NPR hide caption itoggle caption Jason Beaubien/NPR Shots - Health News HIV Testing Goes Mobile In Rural South Africa July 24, 2012 Nearly 1 in 5 South Africans is infected with HIV. But many of them don't know it. The lack of information hinders treatment and also enables the spread of HIV. To close the gap, some groups are taking HIV testing door to door.