VENEZUELA, CARACAS - FEBRUARY 04: Juan Carlos Pena (1) with a rash and other symptoms of Zika Virus is held in arms by his mother Lisbeth Sandoval (33) while being examined by a doctor in a hospital at Petare slum, a suspected area of Zika virus propagation, at east of Caracas, Venezuela on February 4, 2016. Venezuela has recorded 4,700 suspected cases of people infected by the Zika virus according to spokespersons. Zika has been blamed for a recent spike in microcephaly -- a birth defect characterized by unusually small heads and underdeveloped brains in newborns. (Photo by Carlos Becerra/Anadolu Agency/Getty Images)
