This book is the first of an annual series of books which will be based on ICAAC Symposia on Emerging Infections. The editors are in the forefront of the scientific and clinical communities dealing with emerging pathogens. Each chapter is written by an expert in the field and will cover basic science as well as clinical topics. This book and the series will be valuable and popular for a wide range of people working in the fields of infectious diseases, internal medicine, and clinical microbiology.