Immunology is a branch of science that covers the study of the immune system in all organisms. Immunology plays an important role in the fields of organ transplantation, oncology, rheumatology, virology, Pathology, Microbiology, bacteriology, parasitology, psychiatry, and dermatology.
Clinical immunology is the study of diseases caused by disorders of the immune system (failure, aberrant action, and malignant growth of the cellular elements of the system). It also involves other diseases, where immune reactions play a part in the pathology and clinical features.