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Measles: Dr. Richard Besser Responds to Your Questions

February 4, 2015
by Measles: Dr. Richard Besser Responds to Your Questions
Good Morning America & ABC News

At least 90 to 95 percent of the population must be vaccinated to provide "herd immunity" everyone, studies show. Measles vaccination rates for preschoolers are below 90 percent in 17 states, a new report from the public health group Trust for America's Health found.

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