What is type II HS?

Type III hypersensitivity (HS) reactions or immune complex reactions are caused by antibody-antigen complexes (immune complexes) that have not been adequately cleared by innate immune cells Endogenous or exogenous antigen exposure triggers an antibody formation. Exogenous antigens are foreign proteins such as infectious microbes or pharmaceutical products. Endogenous antigens are self-antigens against which autoantibodies are generated (autoimmunity)