This detailed volume explores the field of bacterial virulence and the effort to understand how microbial interaction with a host results in the pathology of a specific disease. This collection of selected protocols includes advanced molecular biology and bioinformatics methods, cell culture and organoid models of infection, as well as in vivo infection models that are useful to study the interaction of pathogens with plants, insects, avian, and mammalian hosts. Written for the highly successful Methods in Molecular Biology series, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible protocols, and tips on troubleshooting and avoiding known pitfalls.