Ten new cases have been identified, which triggered a warning for pregnant women not to travel to a Zika-affected part of Miami.
Reports say the Zika victims were probably infected by local mosquitoes in the Wynwood area.
Pregnant women who had been in the zone since 15th June have been advised to get tested.
Also, women that have been around Wynwood and are planning to have babies, have been advised to wait eight weeks after leaving the area.
