Up to 44 percent of America's new HIV/AIDS infections are clustered in 12 major cities, including Chicago, Washington, New York and Los Angeles, CDC data show. Within these communities, HIV rates are highest among blacks, Hispanics, gay and bisexual men of all races. As researchers gather for the International AIDS Society's 2012 conference, photographer Mike Segar documents patients, their caretakers and peer educators from the African-American community. 20 PHOTOS