What is epidemiology? What are the causes of a new disease? How can pandemics be prevented? Epidemiology is the study of the changing patterns of disease & its main aim is to improve the health of populations It's a vital field central to the health of society to the identification of causes of disease & to their management & prevention Epidemiology has had an impact on many areas of medicine; from discovering the relationship between tobacco smoking & lung cancer to the origin & spread of new epidemics However it is often poorly understood largely due to misrepresentations in the media In this Very Short Introduction Rodolfo Saracci dispels some of the myths surrounding the study of epidemiology He provides a general explanation of the principles behind clinical trials & explains the nature of basic statistics concerning disease He also looks at the ethical & political issues related to obtaining & using information concerning patients & trials involving placebos ABOUT THE SERIES The Very Short Introductions series from Oxford University Press contains hundreds of titles in almost every subject area These pocket-sized books are the perfect way to get ahead in a new subject quickly Our expert authors combine facts analysis perspective new ideas & enthusiasm to make interesting & challenging topics highly readable