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An aedes aegypti mosquitoes is seen in The Gorgas Memorial institute for Health Studies laboratory as they conduct a research on preventing the spread of the Zika virus and other mosquito-borne diseases in Panama City February 4, 2016. REUTERS/Carlos Jasso - RTX25IDW
The U.S. Centers for Disease Control and Prevention (CDC) said on Thursday that it is monitoring 320 U.S. pregnant women with laboratory evidence of Zika infection, up from 287 women a week earlier.