Presents forty-two real clinical cases that illustrate, in a clinical context, essential points about the mechanisms of immunity, as well as describe and explain some of the immunological problems most often seen in a clinic. This new edition vividly illustrates the importance of an understanding of immunology in diagnosis and therapy. Seven completely new cases have been added to this edition. Each case is presented in a consistent format. Basic scientific facts introduce the case history, providing essential background information. The case history is followed by a summary of the disease under study. Cases end with several questions and discussion points that highlight lessons learned from the case.