Joe Raedle

TheĀ Florida Department of Health said Thursday that a 6-year-old student at Fairlawn Elementary School in the town of Fort Pierce, on the state's eastern coast, has contracted measles.

WPTV reportsĀ theĀ child had not been vaccinated.

Florida has a religious-grounds exemption to vaccines, and theĀ station says the schoolĀ has identified other students at the same school who have not been vaccinated due to state-approved exemptions, which also include medical ones. TheĀ Health Department is contacting thoseĀ families to say theirĀ student may not attend school until the completion of an incubation period, the station says.

Fort Pierce is located in St. Lucie County, which according to state records has aĀ 94 percentĀ immunization rate. Health officials recommend a 90 to 95 percent rate to achieve herd immunity from measles.

St. Lucie County lies just north of Martin County (in orange below), which has one of the lowest immunization rates in the state. Here are all the counties with less than 91 percent or less immunization:

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Data from florida-vaccinations.silk.co

And at 5 percent, Martin County also has the second-highest religious exemption rate in the state.

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Data from florida-vaccinations.silk.co

Rob covers business, economics and the environment for Fusion. He previously worked at Business Insider. He grew up in Chicago.