A patient with AIDS at a community hospital in the Central African Republic. Sub-Saharan Africa has high rates of HIV infection -- and was the location for a trial testing the effectiveness of a new strategy for preventing infection. Barbara Debout/AFP via Getty Images hide caption toggle caption Barbara Debout/AFP via Getty Images For over a decade, taking a pill like Truvada every day has been the standard of care for HIV prevention efforts. In clinical trials, this type of preventive drug, ...