Michele Pereira sits with her daughters, Evangeline, 6, right, and Genevieve, 2, at a park in Ashland, Ore., in mid-November. A registered nurse, Pereira is among the growing number of parents questioning the government's schedule of mandatory vaccinations for children. (AP Photo/Jeff Barnard)
Read the article: More U.S. parents opting out of some or all school vaccinations for children
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