The Florida Department of Health in Miami-Dade County told reporters at CBS Miami that one student has been diagnosed with measles. The student was not vaccinated. Parents of potentially at-risk students were notified of the infection, but the health department would not comment on which school was affected, according to CBS Miami. 
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Measles is "the most contagious disease that exists," Alvaro Mejia-Echeverry, of the health department, said. 

This case marks the second known measles cases in Florida this year, according to the Miami Herald.  Last year 189 cases of measles were reported in the United States and in 2014 a record-breaking 667 cases were reported, according to the CDC.  The majority of measle victims were unvaccinated. 

Common symptoms of the Measles include fever, rash on the face and mouth, nasal discharge and a cough. Measles is an airborne disease and may spread through sneezing and coughing, according to WebMD. 

The only protection against Measles is vaccination and most schools require students to receive immunizations. However, parents may opt out of immunizations by filling out a religious exemption form. 

Officials are waiting for the 21-day incubation period to end before they can be assured that no one else was infected. Health officials told CBS Miami that on the student's last day of school the student was symptomatic, which means they were already contagious. 

The school district released a statement saying, “The Miami-Dade County Health Department has informed us that other students were not at risk in this case, but this serves as a good reminder for parents to keep their children’s vaccinations up to date."