What causes common cold? (1) Bacteria (2) Fungi (3) Virus (4) Protozoa

What causes common cold? (1) Bacteria (2) Fungi (3) Virus (4) Protozoa
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(3) Virus Explanation: The common is a viral infectious disease of the upper respiratory tract which affects primarily the nose. Over 200 viruses are implicated in the cause of the common cold; the rhinoviruses are the most common.
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