Zika is spreading in Miami as local officials find the 15th case of infection from mosquito bites.

The Florida Health Department announced Tuesday that another non-travel related case of Zika has emerged in the same Miami neighborhood where 14 other cases have been identified.

The agency said it believes Zika is only spreading via mosquitoes in a one-square mile area in Miami, specifically the neighborhood of Wynwood.

In an unusual move, the Centers for Disease Control and Prevention said on Monday that pregnant women should not travel to the Miami neighborhood north of the city's downtown.

While the virus can cause a mild illness in one out of five people it infects, it also causes the birth defect microcephaly.

CDC Director Tom Frieden told reporters on Monday that aggressive efforts to kill mosquitoes "don't seem to be working as well as we would have liked."

He attributed that to a possibility that the mosquitoes spreading the virus in Miami are resistant to the insecticides being used or that there are some breeding places the agency is missing with sprays.

The growing infections come as the blame game over Zika funding is in full swing.

Congress adjourned last month without approving a $1.1 billion funding package to help federal agencies fight the virus.

While it passed the House, Democrats blocked it in the Senate because of objections to riders on the confederate flag and stripping Planned Parenthood of funding.

"We cannot simply stand by and let this virus spread, when we know we have the resources readily available," Rep. Tom Cole, R-Okla., said in a statement last week after the first mosquito cases was found. "The Zika Conference Report is an immediate implementation of response efforts, and sadly, the Democrats have no sense of urgency or a timeline to get this through the Senate."

Democrats have said they want to approve the full $1.9 billion President Obama asked for in February.

"House and Senate must return to Washington immediately to provide the Zika funding public health officials need to protect Americans," Senate Minority Leader Harry Reid, D-Nev., wrote on Twitter last weekend.