Is the Common Cold Bacterial or Viral in Origin?

What’s the difference between a bacterial and viral infection? WebMD explains, and provides information on the causes and treatments for both.
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As you read this, five percent of us are waging war against the common cold. Up to a billion colds a year occur in the U.S. alone, causing about 60 million lost days of school and 50 million lost days of work—adding up to $25 billion in lost productivity....
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