The 12th edition features the same comprehensive, authoritative content and adds new and updated material throughout. Detailed hands-on procedures make the content more interesting and relevant by describing exactly what takes place in the micro lab. There are 3 new chapters along with general considerations and applications of information provided in Bacterial Sections of Part III which explains the criteria for organism inclusion and how it should be used. This guide to Part III includes gram reaction, shape, arrangement, atmosphere preferred, oxidase and catalase reactions, among other decision points for various pathogens, creating a visual method of identifying and cross referencing organisms.