U.S. health officials are warning pregnant women to avoid Miami Beach, where Florida officials say mosquitoes have spread the Zika virus to five people.
In a statement issued Friday, the Centers for Disease Control and Prevention said pregnant women should avoid travel to the South Beach area, which has been identified as an infection zone.
The CDC said pregnant women also should continue to avoid travel to Miami's Wynwood arts district. That neighborhood was the first site on the U.S. mainland where health officials determined mosquitoes were transmitting Zika.
The CDC also said pregnant women and their partners may want to consider postponing nonessential travel to all of Miami-Dade County if they're concerned about potential exposure to the virus.
In the agency's statement, CDC Director Tom Frieden said it's "difficult to predict how long active transmission will continue."
