Clinical immunology is the branch of medicine that deals with the diagnosis and treatment of diseases resulting from disorders of the immune system. Clinical immunology combines medicine with biological sciences. It deals with the immune system and its defense mechanisms against external agents (bacteria, viruses, fungi). Immunologists are involved in diagnosing autoimmune diseases, immune disorders and often rare diseases, which include:

• congenital immunodeficiencies
• acquired immune deficiencies
• autoimmune diseases
• infections of unclear etiology