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  1. Polio - Symptoms and causes - Mayo Clinic

  2. What is Polio? - Centers for Disease Control and Prevention

  3. Poliomyelitis - World Health Organization (WHO)

  4. Polio - Wikipedia

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

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

  7. Polio (Poliomyelitis) | Johns Hopkins Medicine

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

  9. Poliomyelitis - World Health Organization (WHO)

  10. Polio - Diagnosis and treatment - Mayo Clinic