Immunology in the Twentieth Century: From Basic Science to Clinical Application grew out of common knowledge that those who survived many of the common infectious diseases rarely contracted the same disease again. This book charts the historical development of this vital branch of medicine in a concise volume, covering both the basic science involved and the clinical applications. Immunology as a distinctive subject developed in the mid-twentieth century as researchers started to understand how the adaptive immune system aids the defense against pathogens. The subject has grown in importance and diversified into specialist fields, such as immunohistochemistry, immunogenetics and immunopathology.