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Q J Med 2001; 94: 223-225
© 2001 Association of Physicians

Clostridium difficile infection, hospital geography and time-space clustering

P.B. Kroker, M. Bower and B. Azadian1

From the Departments of Medicine and 1 Microbiology, Chelsea and Westminster Hospital, London, UK

Received 5 May 2000 To analyse spatial and temporal relationships of Clostridium difficile-associated disease in an inner-city hospital, we retrospectively evaluated 283 episodes of confirmed C. difficile diarrhoea in the Chelsea and Westminster Hospital between 1995 and 1998, against a background of relatively stable case mix, antibiotic usage and admission numbers, using Knox analysis to determine the presence of disease clustering in time and space. We found five time-space clusters on four medical wards and between two adjacent units. The clusters were not related to the overall case number on single wards, and were separated in time. Knox time-space analysis provides a simple screening tool to identify disease clusters, assess the efficacy of infection control measures and the influence of hospital geography and traffic. The results support the importance of infection control measures in the prevention of C. difficile-related disease.

Address correspondence to Dr P. Kroker, Medical Day Unit, Chelsea and Westminster Hospital, Fulham Road, London SW10 9NH. e-mail: pbkroker{at}aol.com


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