More than ten years after a study in The Lancet falsely linked autism to the measles, mumps and rubella triple vaccine, evidence of reduced immunization rates and rising incidence of disease are spurring politicians to try to make up lost ground.
California has tightened the laws that allow parents in the state to opt out of immunization for their children. It now joins Washington and Vermont in requiring parents who want an exemption to demonstrate that they have received factual information about the risks and benefits of vaccination from a health-care practitioner or the state’s health department.
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