Mechanism 1.Immunity (1 acute postviral infection immune complex(viral Ag and Ab) connect with platelet Fc-R viral components banding with platelet auto Ab generation (2) chronic: not affected by foreign AgMechanism 1.Immunity (1)acute: postviral infection immune complex (viral Ag and Ab) connect with platelet Fc-R viral components banding with platelet auto Ab generation (2)chronic:not affected by foreign Ag