Whooping cough cases in the US are the highest they've been in a decade - WRAL News
- Whooping cough cases in the US are the highest they've been in a decade WRAL News
- U.S. whooping cough cases soar to highest level in a decade The Washington Post
- Oklahoma school closes due to whooping cough: What is pertussis? Is there an outbreak? Oklahoman.com
- U.S. whooping cough cases hit highest level in a decade Axios