The number of infants born in the U.S. with Zika-related birth defects jumped from 28 as to 32 between Nov. 17 and Nov. 30, according to the most recent numbers from the CDC.
The mosquito-borne and sexually transmitted virus can cause birth defects like microcephaly and other problems in infants born to mothers who are infected. As of Nov. 3, 1,172 pregnant women in the U.S. had lab evidence of possible Zika infection.
All total, there were 4,575 Zika cases in the U.S. as of Wednesday. Of those, 185 were acquired by local mosquitoes in Florida (184) and Texas (one).