This 2006 photo provided by the Centers for Disease Control and Prevention shows a female Aedes aegypti mosquito in the process of acquiring a blood meal from a human host. On Friday, Feb. 26, 2015, the U.S. government said Zika infections have been confirmed in nine pregnant women in the United States. All got the virus overseas. Three babies have been born, one with a brain defect. (James Gathany/Centers for Disease Control and Prevention via AP)