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The number of pregnant women with Zika in America has swelled past 150. The increase has a lot to do with how the CDC is now counting the number of infected.

The number of pregnant women with Zika in America has swelled past 150. The increase has a lot to do with how the CDC is now counting the number of infected. Dr. Jon LaPook explains why health officials are adding women without symptoms to their final count.
May 20, 2016 (02:09)
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