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School by school vaccination rates, examined by the Portland Press Herald, show immunization opt-outs of as much as 20 percent in some schools leave many children vulnerable to infectious disease outbreak.
In the schools most at risk, children who haven’t been immunized account for more than 10 percent of the kindergarten or first-grade students, threatening the ‘herd immunity’ that prevents diseases like measles, mumps, polio and pertussis from spreading. In some schools, more than 20 percent are unvaccinated.
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