A pediatrician uses a syringe to vaccinate a 1-year-old with the measles-mumps-rubella (MMR) vaccine in Northridge, Calif., in this Jan. 29, 2015, file photo. (AP Photo/Damian Dovarganes, File)
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A pediatrician uses a syringe to vaccinate a 1-year-old with the measles-mumps-rubella (MMR) vaccine in Northridge, Calif., in this Jan. 29, 2015, file photo. (AP Photo/Damian Dovarganes, File)
