Risk<unk>  for infection with<unk> virus include not receiving the vaccine, traveling to countries endemic for the virus, immunodeficiency, and malnutrition.  Once infected with the virus, risks for developing<unk> myelitis and severe forms of the disease include muscle trauma, excessive exercise, pregnancy, B-cell immunodeficiency, and tonsillectomy.
Polio risk factors
Epilepsy risk factors
Hearing impairment risk factors
Tremor risk factors
Otosclerosis risk factors
Encephalopathy risk factors
Ischemic stroke risk factors
Ataxia risk factors