The effect of mass vaccination campaigns against polio on the utilization of routine immunization services: A regression discontinuity design

•Mass vaccination campaigns may affect the use of routine immunization services.•Unobserved confounders and reverse causality affect evaluations of mass vaccination campaigns.•We proposed a framework that emulates a randomized trial of exposure to a mass vaccination campaign.•In Bangladesh, we found that exposure to a polio campaign increased the use of routine immunization.•This framework could help evaluate other vaccination campaigns and disease-specific programs.