A new strategy that focuses on targeting "hot zones" - areas where the risk of HIV infection is much higher than the national average - can help stop the spread of the virus in Africa, scientists say. Globally, more than 34 million people are infected with HIV; in sub-Saharan Africa alone, 3 million new infections occur annually. In an attempt to stop the spread of HIV, governments in the region are considering providing antiretroviral drugs to people who do not have the virus but are at risk for becoming infected, researchers said. Such drugs are known as pre-exposure prophylaxis, or PrEP.





