In addition to studying the normal workings of the immune system, immunologists study unwanted immune responses such as allergies, essentially immunological responses of the body to substances or organisms that, as a rule, do not affect most people, and autoimmune diseases (e.g., rheumatoid arthritis and lupus erythematosus) which occur when the body reacts immunologically to some of its own constituents.
Immunologists have developed a large number of procedures have been developed to detect and measure quantities of immunologically active substances such as circulating antibodies and immune globulins. Immune globulins that can be given intravenously (IVIGs) have been found to be more effective against antibody deficiencies and certain autoimmune diseases than their older intramuscular counterparts; their use in a wide spectrum of bacterial and viral infections is under study. Current research in immunology is also aimed at understanding the role of T lymphocytes (see immunity), which play a major part in the body's defenses against infections and neoplasms. AIDS, for example, is the disease that results when the
See studies by R. Desowitz (1988) and R. Gallo (1991).
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