This well-organized booklet, which is based on lectures and laboratory exercises in a medical school, presents concisely the aspects of virology that are of major interest to physicians. It serves as an excellent introduction into this rapidly expanding field. The first short chapter defines the nature of viruses and viral diseases. This is followed by short descriptions of the clinical and laboratory aspects of the different viral diseases. The final part of the book deals with technical matters, presenting a useful description of the virus laboratory and a somewhat sketchy delineation of the common techniques in virology. The presentation is didactic but easy to comprehend, and the great amount of information compressed into this small, readable book is surprising. It can be highly recommended for medical students or for practitioners trying to obtain initial information about this field of medicine.