The New York Times reported on Thursday 18 August 2016:

"A cluster of Zika cases most likely transmitted by local mosquitoes has been identified in Miami Beach, and federal and state officials are considering whether to advise pregnant women to avoid traveling to the city and possibly even all of Miami-Dade County, a health official said Thursday."

"The Miami Beach City Manager Jimmy Morales, in an email to city commissioners, confirmed that two cases of Zika have been tied to Miami Beach. One case is a tourist who had visited Miami Beach two weeks ago. Another case involves a Miami Beach resident who works on the island, Mr. Morales said in the email, which was first reported by The Miami Herald."

On the other hand, according to an AP report of Friday 19 August:

"In a statement emailed late Thursday, city manager Jimmy Morales said Florida's Department of Health is investigating Zika cases in Miami Beach, but none have been confirmed."

And a statement issued on 19 August by the staff of Gov. Rick Scott says in part:

"Today, Governor Rick Scott announced that the Florida Department of Health (DOH) has learned through one of their investigations that five individuals that have already been confirmed as cases of local transmissions of Zika are connected to the Miami Beach area. DOH believes that active transmission of this virus are only occurring in the area of Miami Beach between 8th and 28th streets..."

“In Florida, we know how to prepare. We prepare for storms every summer and we have prepared for Zika since our first travel-related case in February. We have already authorized over $26 million in state funds and we will continue to allocate whatever is needed. We are making every resource available to ensure Miami, and our entire state, remains safe for every family and visitor.”

The official City of Miami Beach Web site is silent on this new development, as far as I can tell.