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→Biochemical Barriers
* '''Lactic and fatty acids''' in sweat and sebaceous secretions are directly bacteriocidal
* '''Lactic and fatty acids''' in sweat and sebaceous secretions are directly bacteriocidal
* '''Enzymes''' e.g. lysozyme in saliva, sweat & tears and Gastric acid denature microorganisms
* '''Enzymes''' e.g. lysozyme in saliva, sweat & tears and Gastric acid denature microorganisms
* Mucus itself is acidic, indigestible and traps microorganisms
* Mucous itself is acidic, indigestible and traps microorganisms
==='''Commensal Organisms'''===
==='''Commensal Organisms'''===