Ephrata Mennonite, a K-12 school with 375 students, is among the most under-vaccinated schools in the state. Less than half its 27 kindergarten students last school year were immune to measles, which can infect nine in 10 unvaccinated people.
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Local doctors say they’re worried that even more cases are spreading under the radar in under-vaccinated pockets of Lancaster County, where 31 cases have been detected.