Anatomic And Physiological Barriers

Barriers can be active or passive in nature. Bacteria grow only in a very narrow temperature range, and elevated body temperature restricts or prevents growth, In mammals, infection-induced fever is a natural attempt to prevent bacterial growth until the acquired immune system becomes activated. Avian species have a slightly different innate temperature-mediated defense system. Chickens have a normally elevated body temperature that prevents infection with organisms such as anthrax that are deadly to most other species.

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