Whooping cough cases rise dramatically nationally and across Delaware Valley, CDC says WPVI-TVWhat are symptoms of whooping cough? Outbreak hits California amid nationwide surge in pertussis ABC7 Los AngelesWhooping cough and walking pneumonia cases are up. Here’s what to know and how to help keep your family safe. CBS NewsWhooping Cough Is Spreading Again after Years of Relative Quiet Scientific AmericanDramatic Jump In Whooping Cough Cases The Weather Channel