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Washington State Makes It Harder to Opt Out of Immunizations

The share of kindergartners whose parents opted out of state immunization requirements more than doubled in the decade that ended in 2008, peaking at 7.6 percent in the 2008-9 school year, according to the state’s Health Department, raising alarm among public health experts. But last year, the Legislature adopted a law that makes it harder for parents to avoid getting their children vaccinated, by requiring them to get a doctor’s signature if they wish to do so. Since then, the opt-out rate has fallen fast, by a quarter, setting an example for other states with easy policies.