Immunization is the first to produce antibodies to plasma cells, and immunization is also the injection of artificially treated pathogens into the human body in another way, thus causing the activation of the adaptive immune response function in the human body, which includes cellular and humoral immunity, of which humoral immunity is mainly mediated by B cells, which mature in the bone marrow to the periphery, and when encountering pathogens invasion B cells get feedback through antigen-presenting cells, thus differentiating into plasma cells, which can produce antibodies to carry out the humoral immune function. B cells are matured in the bone marrow to the periphery, and when invading pathogens are encountered, B cells receive feedback through antigen-presenting cells, which differentiate into plasma cells, which produce antibodies to carry out humoral immune functions. Antibodies are glycoproteins that bind specifically to antigens to destroy the viral and infectious nature of the antigen. After the formation of humoral immunity, a large number of memory cells are left in the body, mainly to remember pathogens and when similar pathogens invade the body again, the first to produce antibodies are memory cells, and memory cells can directly produce a large number of antibodies without an adaptive immune response.