Associated Press
FILE -  In this May 9, 2014 file photo, tourists pose for a photo at the Leblon beach, 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/Hassan Ammar, File)

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