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Mucosal surfaces as the largest immune organ of human body cover 400 m2 of the body including the gastrointestinal, urogenital, and respiratory tracts. The local mucosal immunity is an important first line of defense against many pathogens because most pathogens initiate their infection through access to the mucosal region of body. Also, the mucosal vaccines induce mucosal and systemic immunity simultaneously...
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