Immune system is a misname. The notion of system presupposes elements and relations between them. Unlike digestive system or blood circulatory system or musculoskeletal system the "immune system" doesn't have organs connected with each other to perform the protecting function. It is rather lymphatic system plus a bunch of miscellaneous organs of other systems (including the skin) that address the task of protecting the body against infections. In no way do they form a system.
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