DES MOINES, Iowa — A mumps epidemic is sweeping across Iowa in the biggest outbreak in the country, puzzling 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 only major outbreak in the nation.
"We are calling this an epidemic, not just an outbreak," 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.
Quinlisk said Iowa has had about five cases of mumps a year in recent years, and this is the first large outbreak in nearly 20 years.
"We're trying to figure out why is it happening, why is it happening in Iowa and why is it happening right now. We don't know," she said.
CDC spokeswoman Lola Russell said the federal agency has no answers yet. Quinlisk said one theory is that the infection was brought over from England — perhaps by a college student — because the strain seen in Iowa has been identified by the CDC as the same one that has caused tens of thousands of cases of the mumps in a major outbreak in Britain over the past two years.
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