Associated Press
In this April 28, 2015 photo, Fernando Spilki, virologist and coordinator of the environmental quality program at Feevale University, holds up a water sample, backdropped by the Marina da Gloria, Zone 2, in Rio de Janeiro, Brazil. Spilki said the tests he conducted for the Associated Press so far show that Rio's waters "are chronically contaminated." (AP Photo/Felipe Dana)

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