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RECIFE, BRAZIL - JANUARY 26: Aedes aegypti and other mosquitos are contained in a lab at the Fiocruz institute on January 26, 2016 in Recife, Pernambuco state, Brazil. The Aedes aegypti mosquito transmits the Zika virus and is being studied at the institute. In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to spread throughout nearly all the Americas. At least twelve cases in the United States have now been confirmed by the CDC. (Photo by Mario Tama/Getty Images)

RECIFE, BRAZIL - JANUARY 26:  Aedes aegypti and other mosquitos are contained in a lab at the Fiocruz institute on January 26, 2016 in Recife, Pernambuco state, Brazil. The Aedes aegypti mosquito transmits the Zika virus and is being studied at the institute. In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to spread throughout nearly all the Americas. At least twelve cases in the United States have now been confirmed by the CDC.  (Photo by Mario Tama/Getty Images)