Poliomyelitis, often called polio or infantile paralysis,'s an acute viral infectious disease spread from person to person, primarily via the fecal-oral route. The term derives from the Greek , meaning "grey", , referring to the "spinal cord", and the suffix -itis, which denotes inflammation. Although around 90% of polio infections cause no symptoms at all, affected individuals can exhibit a range of symptoms if the virus enters the blood stream. In about 1% of cases the virus enters the centra… (More on Poliomyelitis)