Unvaccinated Clusters Leave Communities Vulnerable to Illness, Research Shows

Researchers find that people who don't vaccinate children live near each other.

"As a pediatrician, I've seen so many of these diseases cause suffering in children," Besser said. "And every time we get a new vaccine, I think it's a wonderful thing."

He stressed the importance of getting vaccines on time and using online tools to find out vaccination rates in their schools. If they can send their child to a school with higher vaccination rates, they should, he said.