protective immunity to rickettsia tsutsugamushi in a murine model is dependent upon the development of cell mediated immunity , as demonstrated by lymphocyte transfer , production of lymphokines and -interferon by thymus-derived lymphocytes , activation of macrophages by lymphokines and demonstration of delayed-type hypersensitivity response following exposure to these organisms .
C0024264
lymphocyte
C0024297
lymphokines