Synopsis Our knowledge of viruses has increased so rapidly in the last few years, that it has become increasingly difficult for the student to obtain an up-to-date picture of the subject. The primary aim of this textbook, therefore, is to present a succinct account of the essential features of the viruses and related diseases of man in a form suitable for students. The medical practitioner who desires to keep abreast of the latest advances in the clinical aspects, pathology, diagnosis, etiology, methods of spreads, specific treatment, and prevention of this group of infectious diseases will also find information of interest.