Last November, a couple from Washington, D.C., took a weeklong vacation. They visited Mexico, Guatemala and Belize. And got bitten by plenty of mosquitoes.
Two days after they returned home, the woman — who was pregnant — fell ill. She had muscle pain, a fever and a rash.
"At first she didn't think much about it," says OB-GYN Rita Driggers, who saw the woman at Johns Hopkins University School of Medicine. "But then all the news started coming out about Zika, so the woman went and got tested."