For the first time, the Centers for Disease Control and Prevention (CDC) has issued a travel warning for a continental U.S. city, as Miami grapples with a burgeoning Zika outbreak.

Florida Gov. Rick Scott announced this week that an additional 10 people in the state have been diagnosed with the mosquito-borne virus, bringing the total to 14.

CDC Director Tom Frieden warned pregnant women against traveling to the “transmission area” and advised people already in the area to take extra precautions against mosquito bites.

The Miami Herald reports:

The CDC also said couples who have traveled to the area since June 15 should wait eight extra weeks before attempting to become pregnant.

SCROLL TO CONTINUE WITH CONTENT