Now in its fourth edition, Essential Epidemiology is an engaging and accessible introduction to the foundations of epidemiology. It addresses the study of infectious and chronic diseases, public health and clinical epidemiology, and the role of epidemiology in a range of health monitoring and research activities.

This revised and updated fourth edition focuses on the key aspects of ageing and healthcare for older people, especially those with moderate to severe frailty. It has expanded sections on frailty and medicines optimisation with evidence from critically appraised clinical trials formulated into practical guidance for management.

This book has been brought up to date especially for students, and includes a list of key websites, new and revised worksheets and activities and additional information on search strategies.