Florida's governor says the state likely has the first cases of Zika transmitted by mosquitoes on the US mainland.
Rick Scott said on Friday that no mosquitoes in the state had tested positive for the virus. But he says one woman and three men in Miami-Dade and Broward counties likely contracted the disease through mosquito bites.
More than 1,650 Zika infections have been reported in the US, but the four patients in Florida would be the first not linked to travel outside the US mainland.
Mr Scott says health officials believe the infections occurred in a small area just north of downtown Miami.
Zika primarily spreads through bites from tropical mosquitoes. In most people, the virus causes only mild illness, but infection during pregnancy can lead to severe brain-related birth defects for the foetus.
