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  1. Case Definitions/

Open Syndrome Acute Flaccid Paralysis (AFP)

Authors: Division of Disease Surveillance and Response, Ministry of Health

Location: Kenya

Purpose #

Case definition for suspected polio

The definition #

Any case with weakness or floppiness of the limbs of sudden onset not due to trauma in a c hild less than 15 years of age, or any person of any age in whom a clinician suspects polio

Machine-readable definition #

The definition is available in JSON format following the Open Syndrome v1.0 specification:

{
   "authors": [
     "Division of Disease Surveillance and Response"
   ],
   "category": "suspected",
   "definition_type": "case_definition",
   "description": "Case definition for suspected polio",
   "human_readable_definition": "Any case with weakness or floppiness of the limbs of sudden onset not due to trauma in a c hild less than \n15 years of age, or any person of any age in whom a clinician suspects polio",
   "inclusion_criteria": [
     {
       "logical_operator": "OR",
       "type": "criterion",
       "values": [
         {
           "name": "Weakness or floppiness of the limbs in a child 15 years old or less",
           "type": "criterion",
           "values": [
             {
               "description": "Weakness or floppiness of the limbs of sudden onset not due to trauma",
               "name": "Acute flaccid paralysis",
               "type": "symptom"
             },
             {
               "attribute": "age",
               "name": "15 years old or less",
               "operator": "\u003c=",
               "type": "demographic_criteria",
               "unit": "years",
               "value": 15
             }
           ]
         },
         {
           "description": "Any person of any age in whom a clinician suspects polio",
           "name": "Clinical suspicion of polio",
           "type": "professional_judgment"
         }
       ]
     }
   ],
   "keywords": [
     "polio",
     "poliomyelitis",
     "Africa"
   ],
   "language": "English",
   "location": "Kenya",
   "open_syndrome_version": "1.0.0",
   "organization": "Ministry of Health",
   "published_at": "2025-02-08T11:56:57Z",
   "published_by": [
     "Open Syndrome Initiative"
   ],
   "published_in": "https://opensyndrome.org",
   "references": [
     {
       "url": "https://nphi.go.ke/sites/default/files/2024-02/Case%20definition%20Chart_0.pdf"
     }
   ],
   "scope": "broad",
   "status": "draft",
   "target_public_health_threats": [
     "poliomyelitis"
   ],
   "title": "Open Syndrome Acute Flaccid Paralysis (AFP)",
   "version": "1.0.0"
 }

Using the Definition #

Healthcare organizations can implement this definition through:

  • Direct integration with surveillance systems
  • API endpoints for real-time validation
  • Manual case verification processes

Next Steps #

We encourage:

  • Clinical feedback on the definition criteria
  • Technical feedback on the implementation format
  • Suggestions for additional symptoms or signs
  • Reports of implementation experiences

Get Involved #

We welcome contributions and feedback from the community.