What kind of disease is polio disease?

Flu-like symptoms of: sore throat, fever, nausea & vomiting in some, but infection with any serotype of poliovirus may not cause any symptoms in an immune-competent person. If the virus causes meningitis, add headache, stiff/sore neck & back, lethargy & risk of paralysis of the legs & other muscles including the diaphragm. I've seen kids die of poliomyelitis & other vaccine-preventable illnesses. I may see it again.