A vial containing the MMR vaccine is loaded into a syringe before being given to a 1-year-old baby at the Medical Arts Pediatric Med Group in Los Angeles on Feb. 6, 2015.
A vial containing the MMR vaccine is loaded into a syringe before being given to a 1-year-old baby at the Medical Arts Pediatric Med Group in Los Angeles on Feb. 6, 2015. Mel Melcon TNS
A vial containing the MMR vaccine is loaded into a syringe before being given to a 1-year-old baby at the Medical Arts Pediatric Med Group in Los Angeles on Feb. 6, 2015. Mel Melcon TNS

What experts say about vaccination

February 28, 2015 4:54 PM