FILE – In this Jan. 28, 2016, file photo, three-month-old Daniel, who was born with microcephaly, undergoes physical therapy at the Altino Ventura foundation in Recife, Brazil. The mosquito behind the Zika virus seems to operate like a heat-driven missile of disease. Scientists say the hotter it gets, the better the mosquito that carries Zika virus is at transmitting a variety of dangerous illnesses. (AP Photo/Felipe Dana, File)