SOUTHERN ILLINOIS UNIVERSITY / SCIENCE PHOTO LIBRARY SOUTHERN ILLINOIS UNIVERSITY / SCIENCE PHOTO LIBRARY
Close-up of badly infected human tonsils. The tonsils are areas of lymphoid tissue on both sides of the throat. Tonsilitis is an infection of the tonsils. While the tonsils are part of the immune system, and help ward off pharyngeal and upper respiratory infections, persistent tonsilities can lead to their surgical removal.
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