In a national online survey , parents ( N = 802 ) of infants < 12 months old were randomly assigned to receive 1 of 4 MMR vaccine messages : ( 1 ) the Centers for Disease Control and Prevention Vaccine Information Statement ( VIS ) , ( 2 ) VIS and information emphasizing the MMR vaccine 's benefits to the child , ( 3 ) VIS and information emphasizing societal benefits , or ( 4 ) VIS and information emphasizing benefits both to the child and society .