Passive transfer of maternal anti IgG antibody. Body recognizes self as foreign. Plasma cells produce antibodies. Macrophages, antibodies, and complement destroy the self cell that is recognized as foreign. Antigen-antibody complexes form and deposit in tissues and cause tissue damage.
Inflammation sets up.
Vascular permeability increases. Ag enters the body. T cells see Ag as foreign and proliferate memory cells. When T cells meet the Ag again, they release lymphokines. Lymphokines cause a local accumulation of lymphocytes and macrophages.