MIAMI, Fla. (CNN) – Four individuals in Miami-Dade and Broward counties have been infected with the Zika virus by local mosquitoes, Florida health officials said Friday.

These are the first known cases of the virus being transmitted by mosquitoes in the continental United States.

The unidentified individuals had not traveled to a Zika-affected area, had not had sexual contact with someone who had traveled to a place where the virus is circulating and had no other known exposure to the virus.

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