Components of acquired immunity

Components of acquired immunity Acquired immunity has two components – cell mediated immunity (CMI) and antibody mediated immunity or humoral immunity. . Cell mediated immunity When pathogens are destroyed by cells without producing antibodies, then it is known as cell mediated immune response or cell mediated immunity. This is brought about by T cells, macrophages and natural killer cells. . Antibody mediated immunity or humoral immunity When pathogens are destroyed by the production of antibodies, then it is known as antibody mediated or humoral immunity. This is brought about by B cells with the help of antigen presenting cells and T helper cells. Antibody production is the characteristic feature of vertebrates only.