Question

How polio disease occur​

Answer 1

Explanation:

Polio is a viral disease which may affect the spinal cord causing muscle weakness and paralysis. The polio virus enters the body through the mouth, usually from hands contaminated with the stool of an infected person. Polio is more common in infants and young children and occurs under conditions of poor hygiene

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Answer 2

Answer:

The number of cases of polio decreased dramatically in the United States following the introduction of the polio vaccine in 1955 and the development of a national vaccination program. The last cases of naturally occurring polio in the United States were in 1979. Most of the world's population resides in areas considered free of wild poliovirus circulation. Travelers to countries where polio cases still occur should know they are immune or be fully immunized. In 2008, these areas include Africa, Southeast Asia, and the Eastern Mediterranean.