As U.S. measles outbreaks spread, why does ‘anti-vax’ movement persist?

(HealthDay)—Measles outbreaks across the United States—including one in Washington state where 50 cases have now been identified—have again shone the spotlight on parents who resist getting kids vaccinated. These outbreaks are a clear sign of the fraying of “herd immunity,” the overall protection found when a large majority of a population has become immune to a disease, said Dr. Paul […]

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