The Basic Components of the Immune System

Abstract
THE physician has difficulty in coming to grips with the basic concepts of immunology, and the reasons for this are partly historical. Most of the major medical specialties (e.g., cardiology, neurology, and gastroenterology) deal with organ systems that have been recognized for centuries as coherent. Immunology is concerned with cells and molecules spread throughout the body, the functional connections between which have been apparent for at most 40 years. As a result, the medical student picks up little pieces of immunologic knowledge from virtually every subject encountered throughout the curriculum, from zoology to psychiatry. Clinical immunologists seem to be a . . .