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  • Colorful Flu and Cold Viruses

    A cell infected with the influenza virus, which lands roughly 200,000 Americans in the hospital each year, according to the U.S. Centers for Disease Control and Prevention.
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  • Colorful Flu and Cold Viruses

    A computer representation of a flu virus, which is transmitted from person to person through droplets in the air after a sneeze or a cough.
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  • Colorful Flu and Cold Viruses

    A transmission electron microscope image of flu virus particles.
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  • Colorful Flu and Cold Viruses

    A flu shot can help fend of influenza, which kills as many as 49,000 Americans each year, according to the U.S. Centers for Disease Control and Prevention.
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  • Colorful Flu and Cold Viruses

    Coronavirus can cause cold symptoms as well as more severe diseases like SARS.
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  • Colorful Flu and Cold Viruses

    An up close and colorful view of coronavirus, which causes the common cold.
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  • Colorful Flu and Cold Viruses

    Coronavirus can cause symptoms similar to the flu, including sore throat, runny or stuffy nose, fever and body aches.
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  • Colorful Flu and Cold Viruses

    An adenovirus, which can cause the common cold, as well as bronchitis and pneumonia.
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PHOTO: In this stock image, a lumberjack is pictured.
Joze Pojbic/Getty Images
PHOTO: The tires of a Studebaker, missing since 1971, are visible in Brule Creek near Elk Point, S.D. in this undated file photo.
South Dakota Attorney General?s Office/AP Photo
PHOTO: Left, an undated file photo provided by the Spokane County Sheriff shows Bombing Kevin William Harpham; right, in this undated photo provided by the Johnson County Sheriff, Frazier Glenn Cross, Jr., appears in a booking photo.
Spokane County Sheriff/AP Photo| Johnson County Sheriff via Getty Images