Biologically active substances whose activities affect or play a role in the functioning of the immune system.

Synonyms: Immunologic Factors, Response Modifier, Biological, Immune Factor, Modifiers, Biological Response, Biological Response Modifier, Factor, Immunological, Biomodulators, Response Modifiers, Biological, Biomodulator, Factors, Immunological, Immunological Factor, Immune Factors, Immunomodulator, 0, Factors, Immunologic, Factors, Immune, Factor, Immune, Modifier, Biological Response, Immunological Factors, Biological Response Modifiers, Immunomodulators