This Thursday, Jan. 29, 2015, file photo shows boxes of vaccines — including the measles, mumps and rubella virus vaccine (MMR) — inside a freezer at a doctor's office in Northridge, Calif. (AP Photo/Damian Dovarganes, File)
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This Thursday, Jan. 29, 2015, file photo shows boxes of vaccines — including the measles, mumps and rubella virus vaccine (MMR) — inside a freezer at a doctor's office in Northridge, Calif. (AP Photo/Damian Dovarganes, File)
