US doctor issues warning of many undiagnosed polio cases
The New York State medic says there could be hundreds, or even thousands, of infected people there. …
Although weaker than the original or “wild” form of the disease, vaccine-derived polio can still cause serious illness. The virus can attack the nerves in the spine and base of the brain. This can cause paralysis, usually in the legs, but if the breathing muscles are affected too, it can also be life-threatening.