From the Department of Epidemiology at Johns Hopkins University and continuing in the tradition of award-winning educator and epidemiologist Dr. Leon Gordis, comes the fully revised 6th Edition of _Gordis Epidemiology_. This bestselling text provides A SOLID INTRODUCTION TO BASIC EPIDEMIOLOGIC PRINCIPLES as well as PRACTICAL APPLICATIONS in public health and clinical practice, highlighted by real-world examples throughout. New coverage includes EXPANDED INFORMATION ON GENETIC EPIDEMIOLOGY, EPIDEMIOLOGY AND PUBLIC POLICY, and ETHICAL AND PROFESSIONAL ISSUES IN EPIDEMIOLOGY, providing a strong basis for understanding the role and importance of epidemiology in today’s data-driven society. * Covers the basic principles and concepts of epidemiology in a clear, uniquely memorable way, using a wealth of FULL-COLOR FIGURES, GRAPHS, CHARTS, AND CARTOONS to help you understand and retain key information. * REFLECTS HOW EPIDEMIOLOGY IS PRACTICED TODAY, with a new chapter organization progressing from observation and developing hypotheses to data collection and analyses. * Features NEW END-OF-CHAPTER QUESTIONS for quick self-assessment, and a GLOSSARY of genetic terminology. * Provides more than 200 additional multiple-choice epidemiology self-assessment questions online.