Why the Measles Virus is Back Across the United States
![](https://media.wnyc.org/i/800/0/l/85/2019/02/AP_19031786100225.jpg)
- This Feb. 6, 2015, file photo, shows a measles, mumps and rubella vaccine on a countertop at a pediatrics clinic in Greenbrae, Calif.
( AP Photo )
( AP Photo )
Produced by Gwynne Hogan
Hosted by Matt Katz