In this Oct. 12, 2014, file photo, Dr. Tom Frieden, then-head of the Centers for Disease Control and Prevention, speaks at a news conference in Atlanta. (AP Photo/John Amis, File)
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In this Oct. 12, 2014, file photo, Dr. Tom Frieden, then-head of the Centers for Disease Control and Prevention, speaks at a news conference in Atlanta. (AP Photo/John Amis, File)
