Pennsylvania hit hardest by nationwide whooping cough outbreak - TribLIVE
- Pennsylvania hit hardest by nationwide whooping cough outbreak TribLIVE
- Whooping cough cases up more than 340% over this time last year Fox News
- Whooping cough cases surge to record levels in US, CDC says The Hill
- Whooping cough, measles spreading at fastest rate in years FOX 9 Minneapolis-St. Paul
- 800+ cases of whooping cough in WA, 600+ in OR Fox 12 Oregon