AFP and Guillain-Barre syndrome: The Global Advisory Committee on Vaccine Safety recommends that AFP surveillance serve as the backbone of nOPV2 safety surveillance, a sensitive surveillance system that captures conditions of interest that are, or could resemble, paralytic polio (eg, vaccine-associated paralytic polio or Guillain-Barré syndrome).9 This infrastructure further proved beneficial in identifying a cluster of injection neuritis cases due to improper injection.