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Epidemiological Patterns and Hospital Characteristics Associated with Increased Incidence of Clostridium difficile Infection in Quebec, Canada, 1998–2006

Published online by Cambridge University Press:  02 January 2015

Rodica Gilca*
Direction des Risques Biologiques et de la Santé au Travail, Institut National de Santé Publique du Québec, Quebec, Canada Department of Social and Preventive Medicine, Faculty of Medicine, Laval University, Quebec, Canada
Bruno Hubert
Cire des Pays de la Loire, Institut de Veille Sanitaire, Nantes, France
Elise Fortin
Direction des Risques Biologiques et de la Santé au Travail, Institut National de Santé Publique du Québec, Quebec, Canada
Colette Gaulin
Bureau de Surveillance et de Vigie Sanitaire, Ministère de la Santé et des Services Sociaux, Quebec, Canada
Marc Dionne
Direction des Risques Biologiques et de la Santé au Travail, Institut National de Santé Publique du Québec, Quebec, Canada
Institut National de Santé Publique du Quebec, 2400 D'Estimauville, Quebec, PQ, CanadaG1E 7G9 (



To explore epidemiological patterns of the incidence of Clostridium difficile infection (CDI) and hospital characteristics associated with increased incidence during nonepidemic and epidemic years.


Retrospective and prospective ecological study.


Eighty-three acute care hospitals participating in CDI surveillance in the province of Quebec, Canada.


A Serfling-type regression model applied to data obtained from an administrative database (1998-2006) and prospective Quebec CDI surveillance (2004-2006) was used to calculate expected CDI baseline incidence and to detect incidence exceeding the defined epidemic threshold at the provincial and hospital level. Multivariable Poisson regression was used to determine hospital characteristics associated with increased incidence during nonepidemic (1998-2001) and epidemic (2003-2005) periods.


During the study period (1998-2006), 4,525,847 discharges, including 45,508 with a CDI in any diagnosis field, were reported by 83 hospitals. During 1998-2001, the average Quebec incidence of CDI was 10,304 cases in 1,775,822 discharges (5.8 cases per 1,000 discharges) and presented a pattern of seasonality, with similar patterns at the hospital level for some hospitals. The Quebec epidemic started in October-November 2002 and peaked in March 2004 at 845 cases in 40,852 discharges (20.7 cases per 1,000 discharges). In multivariable analysis, higher incidence was associated with location in Montreal and surrounding regions, greater hospital size, larger proportion of hospitalized elderly patients, longer length of stay, and greater proportion of comorbidities in patients, whereas teaching profile was associated with decreased incidence during both nonepidemic and epidemic periods. The effect of geographical location on incidence was greater during the epidemic.


Baseline incidence from nonepidemic years and hospital characteristics associated with CDI incidence should be taken into account when estimating the efficacy of interventions.

Original Articles
Copyright © The Society for Healthcare Epidemiology of America 2010

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