Florida officials are investigating a potential local transmission of the Zika virus in Palm Beach County, but the health officails still believe the virus hasn't spread past a small part of MIami.

Sixteen cases of Zika have been found in which the person was infected by a mosquito bite, the primary mode of transmission of the virus. All of the cases are in a one-square-mile radius in Miami.

The Palm Beach individual who got the virus recently traveled to Miami-Dade County and local officials are investigating the source of infection, according to the governor's office.

The Florida Health Department still believes active transmissions are occurring only in the Miami neighborhood of Wynwood.

Florida has the second largest amount of Zika cases in the U.S., with 322 cases. However, almost all are people who got the virus from another country or territory.

New York has the most cases with 491.

Zika causes a mild infection in most people, but has been found to cause microcephaly, a birth defect in which babies are born with underdeveloped brains and abnormally small heads. The virus also has been linked to Guillain-Barre syndrome, a neurological disorder that can lead to temporary paralysis.

The Centers for Disease Control and Prevention has advised pregnant women to not travel to Wynwood. A similar advisory has been published for other countries and territories where the virus is spreading via mosquitoes.

More than 1,800 people have been found to have Zika in the U.S., but almost all are from travel to one of the 50 countries where Zika has been found.