Federal officials are looking into a huge spike of whooping cough cases in Washington state.
Oregon is also seeing more cases of the illness than last year.
Washington has ten times as many cases of pertussis -- or whooping cough -- as it had a year ago. The Centers for Disease Control is investigating the more than 1,100 reported.
Oregon counts nearly 170 people with whooping cough -- up from 89, last year.
Three of them are at the Riverdale Grade School in Southwest Portland. Interim principal Al Fitzpatrick says the school got a head start on prevention, because a parent of the first sick child, told the school.
Fitzpatrick said "Letting the school have that information lets us then be pro-active, and notify our families."
Oregon health officials have received whooping cough reports from 14 Oregon counties - from Clatsop on the North Coast to Malheur County in the southeast corner.
The illness is best recognized by rapid coughing with a high-pitched "whoop," but the CDC says it starts with general cold symptoms. Unvaccinated infants are considered at greatest risk from the illness.
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This story originally appeared on Oregon Public Broadcasting.