Flores, 38, is 24 weeks pregnant. She and her Guatemalan-born husband spent the first few weeks of her pregnancy in Flores' native Honduras.
"We don't know if she got the infection in that country or in Miami-Dade (County) because both places have ongoing local transmission of Zika virus by the mosquitoes," Dr. Christine Curry told NBC News. Curry leads a team treating Flores and other Zika-infected pregnant women at the University of Miami.