HIV is prevalent in many low - income neighborhoods in U.S. cities . These urban centers have HIV rates on par with sub - Saharan African nations . In Philadelphia , volunteers are going door to door offering free testing . The organization 's founder hopes it will be a model for other cities .
HIV is prevalent in many low-income neighborhoods in U.S. cities . These urban centers have HIV rates on par with sub-Saharan African nations . In Philadelphia , volunteers started going door to door offering free testing . The program 's founder hopes it will be a model for other cities .