Successive introduction of four new vaccines in Rwanda: High coverage and rapid scale up of Rwanda's expanded immunization program from 2009 to 2013

•We present information on Rwanda's rollout of four new vaccines in 5 years.•Careful planning and widespread messaging were used prior to each rollout.•Trained community health workers informed the population of each campaign.•Community health workers helped to forecast the target populations.•Rwanda's experience with rapid rollouts may be useful to other countries.