Health officials are seeing an increase in whooping cough across the nation.
There has been a resurgence of pertussis in Pennsylvania this year. The state Department of Health reports there are three times as many reported cases of whooping cough this year than in 2011.
The pertussis vaccine is recommended for children who enter school. Doctors say the immunization in adults can wear off over the years and they need to get a booster shot to guard against catching whooping cough and spreading the disease to others.
Doctors say you can contract whooping cough by ingesting droplets from someone who is contagious and coughing.
Children who catch the disease or who have been exposed to someone with whooping cough are encouraged to stay home from school for a week and take antibiotics.