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Three days after Gov. Jerry Brown signed one of the nation’s strictest mandatory vaccination bills, several hundred opponents rallied in Santa Monica on Friday and vowed to repeal it.

“I am not going to stop until the truth comes out — this is heinous, this is dangerous,” said Silvana Appleman, an Agoura Hills grandmother who marched with the others from the Santa Monica Pier to City Hall, chanting, “parents call the shots” and “we’re not going away.”

The controversial legislation requires children entering school or day care to be vaccinated against measles, mumps, whooping cough and other diseases. Parents would no longer be able to cite religious or personal beliefs in seeking exemptions.

Children with documented medical conditions, such as allergies or immune system deficiencies, would be excused from immunizations. Parents who decline the vaccinations would have to enroll their children in a home-based private school or public independent study program based off campus.

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