- Most people just had flu-like symptoms.
- 5-10% developed nonparalytic aseptic meningitis with symptoms like fever, headache, vomitting, neck pain and stiffness, muscle spasms, fatigue, etc. that lasted 2-10 days.
- 1% develop the more severe paralytic polio (source)
Meningitis can be caused by MANY, many, many other things besides Polio. Without a spinal tap it would be impossible to know if it was Polio or not, even with some muscle weakness/stiffness. In the middle of the epidemics of the 1950's there was panic and it seems very plausible that many were misdiagnosed.
more to come......