Authored by University of Wisconsin bacteriology professor Kenneth Todar, this online textbook is geared towards college and advanced high school students studying general microbiology and medical bacteriology. The primary sections of the text include: Bacterial Relationships with Animals, Principles of Bacterial Pathogenesis, Bacterial Diseases of Humans, and General Bacteriology. Within these sections links are provided to a wealth of information about growth of bacterial populations, important groups of procaryotes, the bacterial flora of humans, bacterial endotoxin, and much more. The site contains a well-organized table of contents as well as a text box search engine for locating specific subjects. The textbook also includes excellent tables, illustrations, photos, and diagrams. Professor Todar regularly adds and updates information in the textbook.