Sign up for the MSNBC newsletter

You have been successfully added to our newsletter.

Let our news meet your inbox

NOW With Alex Wagner

How whooping cough became an epidemic in 2014

On Friday, California declared an epidemic for whooping cough. How does a preventable illness become an epidemic? Dr. Devi Nampiaparampil and Chris Hayes, host of “All In,” discuss the perils of the anti-vaccination movement.

BEST OF MSNBC

Play All

Have feedback?

How likely are you to recommend msnbc.com to a friend or colleague?

0 = Very unlikely
10 = Very likely
Please select answer

Is your feedback about:

Please select answer

Thank you!

Your feedback has been sent out. Please enjoy more of our content.

We appreciate your help making msnbc.com a better place.