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  1. Polio - Symptoms and causes - Mayo Clinic

  2. Polio - Wikipedia

  3. Polio | Definition, Symptoms, Vaccine, & Facts | Britannica

  4. Poliomyelitis - World Health Organization (WHO)

  5. Poliomyelitis (polio) - World Health Organization (WHO)

  6. Polio: Types, Causes, & Symptoms - Healthline

  7. Polio - Harvard Health

  8. Post-Polio Syndrome | PPS - MedlinePlus

  9. Polio: MedlinePlus Medical Encyclopedia

  10. Polio - NFID