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To Stem Mumps Outbreak, Doctors Try An Extra Vaccination

Each dot represents one case of mumps in a given zip code from June 28, 2009, to June 27, 2010. (The New England Journal of Medicine)
Each dot represents one case of mumps in a given zip code from June 28, 2009, to June 27, 2010. (The New England Journal of Medicine)

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