There’s been a looming fear that mosquitoes would start spreading the Zika virus in the U.S. Now that possibility seems increasingly real.
On Thursday, senior officials at the Food and Drug Administration said they have asked blood donation centers in two Florida counties, Miami-Dade and Broward, to stop collecting blood for the time being.
The move came after investigators ruled out travel as the cause of four cases of Zika virus in those counties. Florida health officials announced the cases last week. The people hadn’t traveled to places where Zika is endemic and don’t appear to have contracted it through sex, leaving a possibility that they got the virus from being bitten by infected mosquitoes in the U.S.