This July 27, 2015, aerial photo shows the Rodrigo de Freitas Lake in Rio de Janeiro, Brazil. An Associated Press analysis of water quality found dangerously high levels of viruses and bacteria from human sewage in Olympic and Paralympic venues. The Rodrigo de Freitas Lake, which was largely cleaned up in recent years, was thought be safe for rowers and canoers. Yet AP tests found its waters to be among the most polluted for Olympic sites. (AP Photo/Leo Correa)
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