This completely updated Second Edition examines the gastrointestinal tract in relation to both immunocompetent and immunocompromised hosts. This edition features discussion on the many infections faced by adult and pediatric populations. New chapters cover Cyclospora and advances in clinical microbiology related to enteric pathogenesis. Other chapters cover diagnosis, treatment, prevention, and control of diseases and consider current effective therapy, pharmacology, prophylaxis, and vaccines. In the book world renowned authors and editors present state of the art summaries of each field