Boxes of single-doses vials of the measles-mumps-rubella virus vaccine live, or MMR vaccine and ProQuad vaccine are kept frozen inside a freezer at the practice of Dr. Charles Goodman in Northridge, Calif., Thursday, Jan. 29, 2015. Some doctors are adamant about not accepting patients who don't believe in vaccinations, with some saying they don't want to be responsible for someone's death from an illness that was preventable. (AP Photo/Damian Dovarganes)
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