Fig. 1From: Evaluation of acute flaccid paralysis surveillance indicators in Sokoto state, Nigeria, 2012–2019: a secondary data analysisFlow chart of AFP surveillance system. CIF - Case Investigation Form, DSNO - Disease Surveillance and Notification Officer, FMoH - Federal Ministry of Health, NPHCDA - National Primary Health Care Development Agency, NIO - National Immunization Officer, NPEC: National Polio Expert Review Committee, SE: State Epidemiologist, WHO SO - World Health Organization Surveillance OfficerBack to article page