SOURCES: American Lung Association web site, "The Common Cold." Medline Plus Medical Encyclopedia web site, "Common Cold." Duke University Health System web site, "Avoiding the Common Cold." FDA "Colds and Flu: Time Only Sure Cure." WebMD Medical Reference, "Understanding Common Cold: Symptoms." Mayo Clinic web site, "Viral infections and bacterial infections: What's the difference?" WebMD Feature, "Call in Sick or Go to Work? Here's Some Advice."

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