Mumps Outbreak in Iowa: "Epidemic"

From AOL:

A mumps epidemic is sweeping across Iowa in the nation's biggest outbreak in at least 17 years, baffling health officials and worrying parents.

As of Thursday, 245 confirmed, probable or suspected cases of mumps had been reported to the Iowa Department of Public Health since mid-January.

The federal Centers for Disease Control and Prevention said it is the nation's only outbreak, which the CDC defines as five or more cases in a concentrated area.

"We are calling this an epidemic," said Iowa state epidemiologist Dr. Patricia Quinlisk, explaining that mumps has spread to more than one-third of the state and does not appear to be confined to certain age groups or other sectors of the population.