Measles cases have spread across the country this year, with the state of New York now facing its worst outbreak in decades.
Since last fall, more than 150 measles cases have been recorded in Rockland County, a New York suburb home to a large ultra-Orthodox Jewish community where there has been some resistance to vaccinations.
The vast majority of states allow families to opt out of getting vaccinated if they object on religious grounds. Parents seem to take advantage of these rules: Researchers have found that broad philosophical and religious exemptions to vaccine requirements are associated with higher rates of unvaccinated children.
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