Two cases of pertussis have been reported at Hillsdale Elementary School in West Chester, prompting officials to bar any students or staff who have not been vaccinated against the disease from entering the building.
The West Chester Area School District says the Chester County Health Department confirmed the second case on Tuesday, qualifying it as an "outbreak" at the site.
Superintendent Jim Scanlon said the district had received "sporadic" reports of pertussis, popularly known as whooping cough, at its schools during January and letters were sent home to parents.
