Acute Upper Respiratory Infec... : Causes
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We call it the "common cold" for good reason. There are over one billion colds in the United States each year. You and your children will probably have more colds than any other type of illness. Children average three to eight colds per year. They...
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A virus is an infectious agent, often highly host-specific, consisting of genetic material surrounded by a protein coat. Viruses infect virtually every life form, including humans, animals, plants, fungi , and bacteria .
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