The discovery opens a new front in the battle against the mosquito-borne virus, which has spread to more than 50 countries and territories since an outbreak began last year in Brazil.
Florida state health officials were not immediately available to comment on the report. Neither were city officials in Miami Beach.
The Miami Herald cited a written statement by City Manager Jimmy Morales saying the city is in constant communication with the health department about the most effective approach to mosquito control.
On Thursday, Miami Beach public works officials and code compliance officers spread out to inspect neighborhoods for mosquito breeding sites.
As of Aug. 17, there were 33 cases of non-travel-related infections in the state. To date the infections have been mostly contained within a small area in the Wynwood neighborhood of Miami.
The prospect of it spreading to the tourism-dependent Miami Beach area is likely to further elevate concerns among health and tourism officials.
Last year, some 15.5 million people spent at least one night in Greater Miami and the Beaches, generating nearly $24.4 billion in direct expenditures, according to the Greater Miami Convention & Visitors Bureau. More than 48 percent of all visitors stayed in Miami Beach.
The Zika virus has been linked to more than 1,700 cases of microcephaly in Brazil, a potentially severe birth defect that can cause infants to be born with shrunken heads and lead to developmental problems.
