Final answer:
Pus is a localized collection of dead pathogens, neutrophils, tissue fluid, and other cells, indicative of the immune response to infection.
Explanation:
Pus is a localized collection of dead pathogens, neutrophils, tissue fluid, and other bystander cells that may have been killed by phagocytes at the site of an infection. As neutrophils fight an infection, they accumulate with cellular debris, forming pus, which is a sign of the immune system's response to infection.
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