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FILE-In this Feb. 11, 2016 file photo, Dallas County Mosquito Lab microbiologist Spencer Lockwood sorts mosquitos collected in a trap in Hutchins, Texas, that had been set up in Dallas County near the location of a confirmed Zika virus infection. U.S. health officials have begun enrolling volunteers for critical next-stage testing of an experimental vaccine to protect against Zika, the mosquito-borne virus that can cause devastating birth defects in pregnant women. (AP Photo/LM Otero, File)

FILE-In this Feb. 11, 2016 file photo, Dallas County Mosquito Lab microbiologist Spencer Lockwood sorts mosquitos collected in a trap in Hutchins, Texas, that had been set up in Dallas County near the location of a confirmed Zika virus infection. U.S. health officials have begun enrolling volunteers for critical next-stage testing of an experimental vaccine to protect against Zika, the mosquito-borne virus that can cause devastating birth defects in pregnant women. (AP Photo/LM Otero, File)

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