Epidemiology is an essential tool for both public health professionals and clinical practitioners. Thjs text is a comprehensive and cohesive text covering the principles and methods of contemporary epidemiologic research. It reflects the conceptual development of this evolving science and the engagement of epidemiologists with an increasing range of public health concerns. The third edition will be completely revised and updated. It will cover a broad range of concepts and methods, such as basic measures, study types, and field methods, as well as advanced topics in data analysis such as hierarchical regression. Specific areas or research wil be touched on such as infectious disease epidemiology, ecologic studies, disease surveillance, analysis of vital statistics, genetic epidemiology and nutritional epidemiology.