past decade. More than 40 authors have contributed to the 31 chapters covering the wide field extending from the bench to the clinic. The book is organised in six parts: basic biology, epidemiology, pathophysiology, clinical features, diagnosis, treatment, and prevention. Basic data are carefully described though persisting difficulties are duly mentioned, such as numerous attempts at in vitro cultivation which remains disappointing and largely contributes to slowing down progress in basic aspects of P caninii. Advances in molecular biology, as well as pathophysiology features, are thoroughly described and referenced. Half of the book is devoted to the clinical management of PCP, and provides a very valuable state of the art. The last chapters analyse new directions of drug research, including data gathered on important families of compounds like derivates of pentamidine, folate antagonists, aminoquinolines, hydroxynaphtoquinones, and B-,-glucan synthesis inhibitors. Overall, this unique book is the most comprehensive source of data in the fast evolving field ofP carinii infection. It will be particularly useful and time saving for researchers. Indeed, it is the reference book on pneumocystis. PIERRE-MARIE GIRARD