|MadSci Network: Immunology|
Pus is the result of the body's reaction to infection (usually by bacteria). When bacteria gain access to living cells (often through a puncture wound) white blood cells (mostly macrophages, monocytes, and neutrophils) react to eliminate the invader by engulfing them. These white blood cells produce special chemicals called chemoattractants that signal other white blood cells to migrate into the infected area (called chemotaxis). The area eventually becomes filled with white blood cells, producing the white color and the swelling that often characterize an in
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