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A pediatrician holds a dose of the measles-mumps-rubella (MMR) vaccine at his practice in Northridge, California. Mumps has been reported in 42 states and the District of Columbia, despite a high compliance rate for vaccinations against the viral infection across the country. (AP Photo/Damian Dovarganes)

A pediatrician holds a dose of the measles-mumps-rubella (MMR) vaccine at his practice in Northridge, California. Mumps has been reported in 42 states and the District of Columbia, despite a high compliance rate for vaccinations against the viral infection across the country. (AP Photo/Damian Dovarganes)

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