Whooping cough is on the rise in North Carolina, where cases have more than doubled this year from the usual number.
Health officials in Mecklenburg County say at least 20 cases of whooping cough, also called pertussis, have been reported in the past month. That's compared to the usual one to three per month.
Most children are vaccinated for the illness, but the vaccine wears off with time.
Whooping cough includes symptoms similar to a cold, but the cough worsens. Within a week or two people have coughing fits that may be accompanied by a whooping sound.