In this Jan. 18, 2016, file photo, a female Aedes aegypti mosquito, known to be a carrier of the Zika virus, acquires a blood meal on the arm of a researcher at the Biomedical Sciences Institute of Sao Paulo University in Sao Paulo, Brazil. Health officials said Thursday, Aug. 4, 2016 that two babies have been born with Zika-related defects in California. The California Department of Public Health said the infants were born to infected mothers who spent time in countries where the virus is circulating.