In this Feb. 11, 2016, file photo, Dallas County Mosquito Lab microbiologist Spencer Lockwood sorts mosquitoes collected in a trap in Hutchins, Texas, that had been set up in Dallas County near the location of a confirmed Zika virus infection. The quest for a vaccine began less than a year ago as Brazils massive outbreak revealed that Zika, once dismissed as a nuisance virus, can harm a fetus' brain if a woman is infected during pregnancy. (AP Photo/LM Otero, File)
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