Polio - Symptoms and causes - Mayo Clinic
Polio - Wikipedia
Polio | Definition, Symptoms, Vaccine, & Facts | Britannica
Poliomyelitis - World Health Organization (WHO)
Poliomyelitis (polio) - World Health Organization (WHO)
Polio: Types, Causes, & Symptoms - Healthline
Polio - Harvard Health
Post-Polio Syndrome | PPS - MedlinePlus
Polio: MedlinePlus Medical Encyclopedia
Polio - NFID