Panic spread like a virus when a letter from the principal of Daniel K. Inouye Elementary School in Wahiawa began circulating on social media. 

It read: "we received a report from the family of a PreK child this morning, stating that their child has measles. The child is not in school and will return once they are cleared from a physician."

Department of Health officials looked into it and later confirmed the child does not have measles.

The school sent a follow up letter Tuesday: 

"The letter sent home yesterday was sent out in an abundance of caution to alert families of a potential health issue reported by a parent."

Measles is a highly contagious virus that can cause ear infections, diarrhea, pneumonia, brain swelling and even death. Signs include high fever, cough, running nose and red, watery eyes followed by a rash that spreads across the body. The virus is spread by direct contact or through the air. 

DOH stresses that measles can be prevented with the measles, mumps and rubella vaccine: the MMR vaccine.

It's one of the vaccinations required under state law for Hawaii students.