Centers for Disease Control and Prevention Director Dr. Tom Frieden, center, gestures as he speaks with members of the media after a news conference, Thursday, Aug. 4, 2016, in Doral, Fla. The CDC has warned expectant mothers to steer clear of the city's Wynwood neighborhood, where at least 15 people are believed to have been infected with the Zika virus through mosquito bites in the first such cases on record in the mainland U.S. (AP Photo/Wilfredo Lee)
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