Authorities at Beverly Cleary School in Portland say there was a confirmed case of whooping cough there this week.
It comes after two cases at Beaverton High School a couple of months ago.
Dr. Jennifer Vines with Multnomah County Health Department says so far this year there have been 26 reported cases, which is about average.
In 2012 there were three times as many cases.
“Like every four, five, six years, we tend to see a spike," said Vines. "So, I’m not making any predictions, but so far this year we’re not seeing that spike.”
Symptoms of pertussis normally develop within 5 to 10 days after exposure. It’s called whooping cough because of the sound sufferers make as they take deep breaths following a coughing fit.
Schools are urging parents to take precautions if their children develop symptoms, and to ensure kids are up to date on their vaccinations.
The U.S. Centers for Disease Control and Prevention note that whooping cough is very contagious and vaccines are the best way to stop its spread.