With falling U.S. vaccination rates and outbreaks that have been responsible for more than 580 cases and at least two deaths, health experts expect measles to spread.
Our reporter describes how a high rate of vaccination is needed to protect a community from a highly contagious disease like measles, a threshold known as “herd immunity.”
Video by Aatish Bhatia, Laura Salaberry, Rebecca Suner, Zach Wood and Francesca Paris/The New York Times
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