The Montgomery County Office of Public Health has identified an increase in cases of pertussis, also
known as whooping cough, at Plymouth Whitemarsh High School.
The department said symptoms include a runny nose, sudden, uncontrollable bursts or spells of coughing, and a persistent cough that sometimes causes vomiting.
If your child has symptoms, they should stay home from school and activities, according to health officials.
Get top local stories in Philly delivered to you every morning. >Sign up for NBC Philadelphia's News Headlines newsletter.
Officials also recommended making sure your family's pertussis vaccinations are up to date.
Sign up for our Breaking newsletter to get the most urgent news stories in your inbox.