And now health experts and school officials are trying to get the word out about 2 whooping cough cases at East Goshen Elementary.
Both children are recovering, and vaccinations are being offered to children who need them.
In February, there were 2 cases at Hillsdale elementary, and individual cases have been reported at other schools in the district.
Great Valley High School in Malvern also had a pair of pertussis cases in January.
Pertussis cases often rise in summertime, with the peak in late summer or early fall.
