Copyright © 2022 Medeiros, Ingham, Nanque, Correia, Stegger, Andersen, Fisker, Benn, Lanaspa, Silveira and Abrantes.; After the eradication of polio infection, the plan is to phase-out the live-attenuated oral polio vaccine (OPV). Considering the protective non-specific effects (NSE) of OPV on unrelated pathogens, the withdrawal may impact child health negatively. Within a cluster-randomized trial, we carried o...