FILE - In this Monday, Feb. 1, 2016 file photo, a Sucre municipality worker fumigates for Aedes aegypti mosquitoes that transmit the Zika virus in the Petare neighborhood of Caracas, Venezuela. Ahead of the annual American College of Cardiology conference in Washington in March 2017, doctors say they have tied infection with the Zika virus to possible new heart problems in adults. The evidence is only in eight people in Venezuela and does not prove a link. It's too soon to know how often this might be happening, although it seems less common than the troubles the mosquito-borne virus has been causing for pregnant women and their fetuses. (AP Photo/Fernando Llano)
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