Florida Gov. Rick Scott says officials have identified a second area of Zika transmission on the U.S. mainland.
Scott told reporters Friday that five Zika infections have been linked to an area that encompasses most of tourist-friendly South Beach.
Florida Department of health spokeswoman Mara Gambineri says officials believe the cases were transmitted by mosquitoes.
Miami’s Wynwood arts district was the first site on the U.S. mainland where health officials determined mosquitoes were transmitting Zika.
Scott says two of the Miami Beach cases involved Miami-Dade County residents, and three involved tourists from New York, Texas and Taiwan.
Scott says the county has begun an aggressive mosquito-eradication plan in Miami Beach.
U.S. health officials are warning pregnant women to avoid Miami Beach.
In a statement Friday, the U.S. 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.
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.”