Pediatrician Charles Goodman vaccinates 1-year-old Cameron Fierro with the measles-mumps-rubella vaccine, or MMR vaccine, at his practice in Northridge, Calif., on Jan. 29, 2015. (Associated Press) **FILE**
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Pediatrician Charles Goodman vaccinates 1-year-old Cameron Fierro with the measles-mumps-rubella vaccine, or MMR vaccine, at his practice in Northridge, Calif., on Jan. 29, 2015. (Associated Press) **FILE**
