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Polio (poliomyelitis) is a disease that is caused by poliovirus, an RNA virus; that spreads from person to person and can infect a person’s spinal cord, causing paralysis.
The history of polio (Poliomyelitis) infections began during prehistory. Polio circulated in human populations at low levels and appeared to be a relatively uncommon disease for most of the 1800s. In 2016, it continues to circulate in just Afghanistan and Pakistan, with occasional spread to neighbouring countries.
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