This, the twelfth edition of Bailey and Scott's Diagnostic Microbiology, is the third consecutive edition that we have co-authored. Although we have learned much during our preparation of these three editions, the dynamics of infectious disease trends along with the technical developments available for diagnosing, treating, and controlling these diseases has continued to present major challenges. In meeting these challenges, our primary goal has always been to provide an updated and reliable reference text for practicing clinical microbiologists and technologists while also presenting this information in a format that supports the educational efforts of all those responsible for preparing others for a career in diagnostic microbiology. Admittedly this is not an easy task. We realize that in our efforts to achieve both purposes we have had to make some difficult decisions, the results of which may from time to time dissatisfy either the practitioners or the educators. Nonetheless, by carefully reviewing the compliments and the criticisms of our eleventh edition readers, we believe that in the twelfth edition we were able to achieve strong compromise for both a reference and a teaching text.

To align our goals with the reader's expectations and needs, we have kept the favorite features and made adjustments in response to important critical input from users of the text. Key features such as the glossary and the case studies have been updated. Importantly, more new case studies have been added. Also, the succinct présentation of each organism group's key laboratory, clinical, epidemiologic, and therapeutic features in tables and figures has been kept and updated, and new tables have been added. Regarding content, the major changes reflect the changes that the discipline of diagnostic microbiology continues to experience. The chapter that deals with molecular methods for identifying and characterizing microbial agents has been expanded and updated. Also, although the grouping of organisms into sections according to key features (e.g., Gram reaction, catalase or oxidase reaction, growth on MacConkey) has remained, changes regarding the genera and species discussed in these sections have been made. These changes, along with changes in organism nomenclature, were made to accurately reflect the changes that have occurred, and continue to occur, in bacterial taxonomy. Also, throughout the text the content has been enhanced with new photographs, line drawings, and color schemes for tables. Finally, although some classic methods for bacterial identification and characterization developed over the years (e.g., catalase, oxidase, Gram stain) still play a critical role in today's laboratory, others (e.g., IMViC profile) have given way to commercial identification systems. We realize that in a textbook such as this that balances the needs for practicing and teaching diagnostic microbiology, our selection of identification methods that received the most detailed attention may not always meet the needs of both groups. However, we have tried to be consistent in selecting those methods that reflect the most current and common practices of today's clinical microbiology laboratories.

Finally, in terms of organization, the twelfth edition is similar in many aspects to the eleventh edition, but some changes have been made. Part I contains three chapters that address the basic field of medical microbiology in terms of taxonomy, genetics, physiology, and host interactions. Part n comprises nine chapters that address the basic principles of clinical microbiology, including laboratory safety, microscopy, serology, molecular testing, and antimicrobial susceptibility testing. All of bacteriology is captured in Part ¿I, which begins with three brief overview chapters on identification schemes and the organization and use of the subsequent organism-based chapters. Part in is then further organized into subsections based on key identification features, with supporting chapters for specific organism genera. Parts IV, V, and VI address, in total, the areas of parasitology, mycology, and virology, respectively. The 10 chapters in Part VII explore diagnostic microbiology from the human organ system perspective and emphasize clinical manifestations and diagnostic protocols. The twelfth edition ends with Part VIH, which uses four chapters to address important aspects of clinical laboratory management, including a new chapter regarding bioterrorism.

We offer various instructor ancilláries specifically geared for the twelfth edition. The Evolve Resources include an instructor's manual, a 900-question test bank, a laboratory manual, and an electronic image collection, all with instructor-only access. Student resources include weblinks and content updates.

A Study Guide is available and includes chapter objectives, summary of key points, review questions, and case studies.

We sincerely hope that clinical microbiology practitioners and educators alike find Bailey and Scott's Twelfth. Edition to be a worthy and useful tool to support their professional activities.

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Bacterial Vaginosis Facts

This fact sheet is designed to provide you with information on Bacterial Vaginosis. Bacterial vaginosis is an abnormal vaginal condition that is characterized by vaginal discharge and results from an overgrowth of atypical bacteria in the vagina.

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