Whooping cough cases are more than double those seen at the same time last year, with 8,064 cases recorded nationwide so far this year.
California's whooping cough epidemic continues to escalate and it could get even worse as kids head back to school this month.
Health officials are warning residents that California is currently experiencing a whooping cough epidemic.
Cases of pertussis, a potentially deadly disease also known as whooping cough, are on the rise in Napa County this year.