Over the years, instructors at more than 1000 colleges and universities have made Microbiology: An Introduction, their #1 choice. The new sixth edition builds on the hallmark features of past editions--an accessible writing style, a systems approach to diseases, an exceptional art program--and adds new features and supplements that meet the needs of today's students and instructors. This new edition becomes an even better teaching and learning tool with a new Interactive Student Tutorial CD-ROM, expanded critical thinking opportunities, a new Taxonomic Guide to Diseases Appendix, a World Wide Web Site, enhanced step-by-step descriptions added to text and illustrations, expanded end-of-chapter learning materials, and additional coverage of hot topics such as emerging infectious diseases, antibiotic/multi-drug resistance, and rapid identification of microorganisms.