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A common cold is an infectious illness that affects the upper respiratory tract, specifically the nose and mouth. Any one of a hundred or more viruses will cause it. Read the Natural Tips for Prevention of Common Cold and protect yourself and others. Viruses, unlike bacteria, only reproduce inside the cells of the human body. Cold viruses, for example, only infect the membranes covering the nose and mouth, indicating a preference for certain types of tissue. While within these tissues, the viruses seize hold of the tissue cells’ activities and begin quickly multiplying.
