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Take a look at the influenza virus under a microscope, and you'll see a funny-looking spiked ball, much like the famous Russian satellite Sputnik. But if you've ever been flat on your back with the flu, you know there's nothing funny about this highly contagious virus. Test your savvy by taking this quiz.
Medical Reviewer: Bass, Pat F. III, MD, MPH Foster, Sara, RN, MPH
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