Description- This pioneer book in the area of Basic and Clinical Epidemiology in Indian sub-continent gives an introduction to principles and practice of Basic and Clinical Epidemiology in a simple and lucid manner. Book starts with factors leading to disease causation and details the interaction between Agent, Host and Environment. An introduction to the environmental and occupational epidemiology is given. The book attempts to integrate the Basic Epidemiology taught in didactic lectures with the process and of Clinical Research in Practice. Contents- 1- Why basic and clinical Epidemiology 2- Disease Transmission 3- Immunity and Immunization 4- Public health 5- Measurements of health and disease 6- Study types in Epidemiology 7- Statistics in Epidemiology 8- Causation and its relationship to Epidemiology. 9- Clinical Epidemiology 10- Preventive Epidemiology 11- Epidemiology and health policies 12- Occupational Epidemiology 13- Environmental Epidemiology 14- Infectious disease Epidemiology 15- Evidence based medicine in clinical Epidemiology 16- Randomized clinical trials 17- Uncontrolled trials 18- Sample size calculations in studies 19- Ethics in clinical trials 20- How to evaluate a research paper 21- Process of clinical research : hypothesis to proof 22- Why do clinical trials 23- Updating knowledge in Epidemiology 24-Commonly used terms in basic and clinical Epidemiology