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About 31 million Americans are affected by a sinus infection each year. Microorganisms, like viruses, bacteria, or fungus, can take over one or more sinuses and trigger a sinus infection, also known as “sinusitis.”

People in the U.S. suffer from more than one billion colds a year, and there were about 40 million flu illnesses during last year’s U.S. flu season alone. Can you tell the difference between a cold and the flu?