OBJECTIVES: To test the effectiveness of messages designed to reduce vaccine
misperceptions and increase vaccination rates for measles-mumps-rubella (MMR).
METHODS: A Web-based nationally representative 2-wave survey experiment was
conducted with 1759 parents age 18 years and older residing in the United States who have
children in their household age 17 years or younger (conducted June–July 2011). Parents
were randomly assigned to receive 1 of 4 interventions:(1) information explaining the lack of …