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biology
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Learn about the common cold, its causes, and remedies
Common colds are viral infections that arise in the upper respiratory tract. They...
Video: Science in Seconds (www.scienceinseconds.com) (A Britannica Publishing Partner)
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White blood cell
A neutrophil, a type of white blood cell (in blue), interacts with pneumonia bacteria...
David Dorward, Ph.D.—National Institute of Allergy and Infectious Diseases/Centers for Disease Control and Prevention (CDC)
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