Lactic Acid Bacteria and Host Immunity

Abstract

The immune system is the most effective barrier for the host to defend against the invasion of external pathogens. The system consists of a series of immune organs, immune cells, and immune active substances (immune molecules), which can detect and eliminate non-autologous substances, such as foreign pathogens and foreign bodies, and its own mutant cells. Among them, immune organs include bone marrow, spleen, lymph nodes, tonsils, small intestine collecting lymph nodes, appendix, thymus, etc.; immune cells include lymphocytes, mononuclear phagocytic cells, neutrophils, basophils, eosinophils, hypertrophy cells, platelets, etc.; immune molecules include the complement, immunoglobulin, interferon, interleukin, tumor necrosis factor, etc. Different types of immune tissues, immune cells, and immune molecules have different roles, and they coordinate the functions of various parts through lymphocyte recycling and various immune molecules.