Why waning herd immunity is leading to measles outbreaks – GWC Mag

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Why waning herd immunity is leading to measles outbreaks – CBS News

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Measles were eradicated in the United States decades ago, but decreased vaccination rates have threatened the country’s herd immunity against the disease. New outbreaks have been reported, including nine cases in Philadelphia that affected a hospital and a day care center. Stephen Stock reports.

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