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Associated Press
FILE - In this Aug. 2, 2015, file photo, triathletes enter the water at the start of the men's triathlon ITU World Olympic Qualification Event in Rio de Janeiro, Brazil. Hundreds of thousands of foreign visitors are expected for the Olympics, which open Aug. 5. 2016. But there are growing concerns that some may stay away, frightened off by the mosquito-borne virus that is being linked to severe birth defects. (AP Photo/Felipe Dana, File)

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