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Plunge in kindergartners' vaccination rate worries health officials
Plunge in kindergartners' vaccination rate worries health officials

California parents are deciding against vaccinating their kindergarten-age children at twice the rate they did seven years ago, a fact public health experts said is contributing to the reemergence of measles across the state and may lead to outbreaks of other serious diseases. The percentage of kindergartens in which at least 8% of students are not fully vaccinated because of personal beliefs has more than doubled as well, according to data on file with the state. That threshold is significant because communities must be immunized at a high rate to avoid widespread disease outbreaks. It is a concept known as herd immunity, and for measles and whooping cough at least 92% of kids need to...

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