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Polio is a contagious disease affecting humans and some primates. Three closely related viruses cause polio. In serious cases Polio attacks the spinal cord and brain stem and eventually causes paralysis. In Polio the muscular, brain and nervous systems are affected, and is spread by contaminated food, water, hands and eating utensils.
Polio was one of the most feared diseases in the 20th century. The connection between the neurological symptoms of Polio and the more typical form of the disease was suspected by only a handful of researchers in the first decade of the 20th century, bu…
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