(a) Polio is caused by
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Explanation:
A virus that may cause paralysis and is easily preventable by the polio vaccine.
Polio is transmitted through contaminated water or food, or contact with an infected person.
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Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus. The virus spreads from person to person and can infect a person's spinal cord, causing paralysis (can't move parts of the body).
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