The primary intent of this book is to serve as a rapid review of Microbiology principles and serve as a study aid to improve performance on Microbiology written and practical examinations. With this goal in mind, the text is written in rapid-fire, question/answer format. The student receives immediate gratification with a correct answer. Questions themselves often contain a 'pearl' reinforced in association with the question/answer. Additional hooks are often attached to the answer in various forms, including mnemonics, evoked visual imagery, repetition and humour. Additional information not requested in the question may be included in the answer. The same information is often sought in several different questions. Emphasis has been placed on evoking both trivia and key facts that are easily overlooked, are quickly forgotten, and yet somehow always seem to appear on Microbiology exams.