Ninety percent of the cells in the human body are bacteria, and humans may be host to many thousands of different species of bacteria. These striking statistics are part of a new paradigm in microbiology in which bacteria are no longer viewed as disease-causing killers but more as lifelong partners which are often essential for the survival of their host. This book brings together a group of diverse scientists - evolutionary biologists, immunologists, molecular biologists, microbiologists, pathologists and mathematicians - to discuss the evolution and mechanisms of bacteria-host interactions...