In some cases, polio can cause irreversible paralysis in the unvaccinated, but only for around one in 200 cases.
In the early to mid 20th Century, polio was a massive problem with affected patients being attached to what was known as an iron lung in order to help them breathe.
Furthermore, although polio can be prevented, there is no cure for the virus once someone becomes infected.
Famous figures affected by the virus include Mary Berry, Mia Farrow, Donald Sutherland, Joni Mitchell, and Ian Dury; in the case of Berry, the former host of the Great British Bake Off was left with a weaker left hand, thinner left arm, and twisted spine.
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