Contagionism is an old idea, but gained new life in Restoration Britain.  The Germ of an Idea considers British contagionism in its religious, social, political and professional context from the Great Plague of London to the adoption of smallpox inoculation. It shows how ideas about contagion changed medicine and the understanding of acute diseases.

Margaret DeLacy is an independent scholar. She received her Ph.D. in British history from Princeton University, USA. She is the author of Prison Reform in Lancashire, 1700-1850: A Study in County Administration and several articles on British medical history.