Epidemiology is the study of health and disease patterns at the population level. It is the cornerstone of evidence-based public health research, providing standardised methodologies to identify risk factors for disease and to evaluate the effectiveness of health care and public health interventions. This book examines the underlying concepts and applications of epidemiology including: Population measures of health and disease Descriptive and analytical study designs Intervention trials Interpretation of epidemiological studies Preventive strategies Routine surveillance and monitoring This new edition features: New chapter on study design and data handling Thorough revision throughout including new material on Monitoring and Evaluation in the chapter on Epidemiological surveillance Revised structure to improve the reader experience Updated and additional exercises for self-testing A broader range of case studies and activities which cover contemporary health problems such as AIDs, obesity and mental health problems, as well as problems of exposure such as to radiation or pollution.