This newly revised dictionary has been thoroughly updated and considerably expanded. Prepared with the help of over 100 epidemiologists from around the world, the dictionary is the standard reference of its kind for the field of epidemiology. It is designed to guide students and health professionals through the often confusing terminology of the field, with entries that go beyond brief definitions in their discussion of basic concepts. Relevant terms from biostatistics and such disciplines as demography, microbiology, and sociology are included.