This volume is the seventh in a series of books based on ICAAC Symposia on Emerging Infections. It offers an updated review of new and emerging infectious diseases, including Avian Influenza (H5N1), Severe Acute Respiratory Syndrome (SARS), West Nile fever, and many others. The editors are experts in their respective fields of research and are active in the scientific and clinical communities that deal with emerging pathogens. The Emerging Infections series is a valuable resource for a wide range of people working in microbiology, Infectious diseases, epidemiology, public health, and clinical medicine.