This text provides a concise review of the medically important aspects of microbiology that covers the basic and clinical aspects of bacteriology, virology, mycology, parasitology and immunology. It also aims to provide students with a solid understanding of the clinical relevance of microbiology. The book contains pedagogical features such as clinical case discussions, over 600 sample questions in USMLE format and a USMLE practice exam. All chapters have been updated for this revised edition, with particular emphasis on topics such as human immunodeficiency virus, hepatitis viruses and microscopic organisms (mites, fleas). It also features summary tables that describe the clinical and epidemiological aspects of important organisms.