Wolf Blitzer delivers the most important breaking news and political, international, and national security stories of the day. Tune to The Situation Room weekdays 5-7pm ET on CNN.
A rise in whooping cough cases has doctors on the alert and asking questions as to why. CNN's Mary Snow reports.
You must be logged in to post a comment.
The Situation Room with Wolf Blitzer is the command center for breaking news, politics and extraordinary reports from around the world. Tune in weeknights from 5-7pm ET on CNN.
Subscribe | About Wolf Blitzer