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What is the definition of Biological Barriers in immunology

What is the definition of
Biological Barriers in immunology
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Biological barriers are the barriers of immune system which includes living organisms i.e bacteria which competes with the invading pathogens that can cause infection to the body. They act as the 1st line of defense in the body. And these bacteria are almost harmless until the body gets very much immuno-compromised. They are mainly present in those areas of body which are exposed to the external environment like, skin, gastrointestinal tract, genital tract, urinary tract, etc. These bacteria changes the pH, releases various toxins also posses some anti microbial activity which competes and acts against the invading pathogens.

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