Immunology:

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 diseases of other systems, where immune reactions play a part in the pathology and clinical features.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". The study of diseases caused by immune system disorders is called?
Clinical immunology