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American Journal of Epidemiology Advance Access originally published online on August 18, 2006
American Journal of Epidemiology 2006 164(7):624-626; doi:10.1093/aje/kwj261
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American Journal of Epidemiology Copyright © 2006 by the Johns Hopkins Bloomberg School of Public Health All rights reserved; printed in U.S.A.

Invited Commentary

Invited Commentary: Clues to the Etiology of Inflammatory Bowel Disease—A Return to John Snow?

Paul Moayyedi

From the Department of Medicine, Division of Gastroenterology, McMaster University Medical Centre, Hamilton, Ontario, Canada

Correspondence to Dr. Paul Moayyedi, Department of Medicine, Division of Gastroenterology, McMaster University Medical Centre, 1200 Main Street West, HSC 4W8B, Hamilton, Ontario L8N 3Z5, Canada (e-mail: moayyep@mcmaster.ca).

Received for publication October 31, 2005. Accepted for publication March 13, 2006.

Abbreviations: GIS, geographic information systems; IBD, inflammatory bowel disease; Th1, T helper cell type 1; Th2, T helper cell type 2

The first 150 words of the full text of this article appear below.

It has been over 150 years since John Snow observed that a specific outbreak of cholera in a small geographic area of London, United Kingdom, seemed to be associated with a Broad Street water pump (1Go). The fall in cholera cases after the pump was padlocked supported his theory that cholera was spread by a waterborne contagious agent. His statistical mapping methods led many to suggest that John Snow is the father of modern epidemiology (2Go). It is ironic that a technique that led to one of the famous success stories of public health medicine has largely been ignored by clinical epidemiologists.

The increasingly sophisticated environmental information available in databases and the development of statistical packages that will perform complex spatial data analysis has led to a resurgence of interest in geographic information systems (GIS) (3Go). The paper by Green et al. (4Go) in this issue . . . [Full Text of this Article]


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C. Green, L. Elliott, C. Beaudoin, and C. N. Bernstein
Green et al. Respond to "Clues to the Etiology of Inflammatory Bowel Disease"
Am. J. Epidemiol., October 1, 2006; 164(7): 627 - 628.
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