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MCALLEN, TX - APRIL 14:  A city environmental health worker displays literature to be distrubuted to the public on April 14, 2016 in McAllen, Texas. Health departments, especially in areas along the Texas-Mexico border, are preparing for the expected arrival of the Zika Virus, carried by the aegypti mosquito, which is endemic to the region. The U.S. Centers for Disease Control (CDC), announced this week that Zika is the definitive cause of birth defects seen in Brazil and other countries affected by the outbreak.  (Photo by John Moore/Getty Images)
MCALLEN, TX - APRIL 14:  A city environmental health worker displays literature to be distrubuted to the public on April 14, 2016 in McAllen, Texas. Health departments, especially in areas along the Texas-Mexico border, are preparing for the expected arrival of the Zika Virus, carried by the aegypti mosquito, which is endemic to the region. The U.S. Centers for Disease Control (CDC), announced this week that Zika is the definitive cause of birth defects seen in Brazil and other countries affected by the outbreak.  (Photo by John Moore/Getty Images)

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    FDA: Screen all blood donations for Zika

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FDA: Screen all blood donations for Zika

The Food and Drug Administration recommended screening the entire US blood supply for the Zika virus. The FDA noted that screening donated blood is already underway in Florida and Puerto Rico. CNN's Dr. Sanjay Gupta reports.

FDA: Screen all blood donations for Zika

The Food and Drug Administration recommended screening the entire US blood supply for the Zika virus. The FDA noted that screening donated blood is already underway in Florida and Puerto Rico. CNN's Dr. Sanjay Gupta reports.