In its most severe form, polio causes ...

In its most severe form, polio causes paralysis of the muscles of the legs, arms, and respiratory system. All muscle tone is lost in the affected limb, and the muscle becomes flaccid and begins to atrophy, as shown in the illustration above. (Illustration by Electronic Illustrators Group.)

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Use of the Drinker respirator (iron lu...

(Library of Congress.)

In its most severe form, polio causes ...

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