In this Commentary, Gilaad G. Kaplan, MD, of the department of medicine, University of Calgary, Alberta, Canada, discusses the four epidemiological stages of inflammatory bowel disease (IBD) and reviews the forecast of disease prevalence and how disease penetration through a population evolves over time.

There are four epidemiological stages of IBD — emergence, acceleration in incidence, compounding prevalence and prevalence equilibrium. We believe we could place every country into one of the first three epidemiological stages of IBD evolution, currently. Over time, we feel that

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