Careful cherry picking data....
From your source in context:
Most people who get infected with poliovirus (about 72 out of 100)
will not have any visible symptoms.
About
1 out of 4 people with poliovirus infection
will have flu-like symptoms that may include:
- Sore throat
- Fever
- Tiredness
- Nausea
- Headache
- Stomach pain
These symptoms usually last 2 to 5 days, then go away on their own.
A smaller proportion of people with poliovirus infection
will develop other, more serious symptoms that affect the brain and spinal cord:
- Paresthesia (feeling of pins and needles in the legs)
- Meningitis (infection of the covering of the spinal cord and/or brain) occurs in about 1 out of 25 people with poliovirus infection
- Paralysis (can’t move parts of the body) or weakness in the arms, legs, or both, occurs in about 1 out of 200 people with poliovirus infection
Paralysis is the most severe symptom associated with polio, because it can lead to permanent disability and death. Between 2 and 10 out of 100 people who have paralysis from poliovirus infection die, because the virus affects the muscles that help them breathe.
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Your sample set is not of the whole population - you have referred to 2-10% of those exhibiting one symptom of "smaller proportion" of 25%.
Polio is also predominantly spread via the focal oral route. You can't usually get it just being in the same room as someone else.