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.