Factors Affecting Surveillance Data on Escherichia coli O157 Infections Collected from FoodNet Sites, 1996–1999
1University of Minnesota, College of Veterinary Medicine, St. Paul, and 2University of Minnesota, School of Public Health and 3Minnesota Department of Health, Minneapolis; 4California Emerging Infections Program, San Francisco; 5Connecticut Emerging Infections Program, New Haven; 6Georgia Emerging Infections Program and 7Foodborne and Diarrheal Diseases Branch, Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia; 8University of Maryland School of Medicine, Baltimore; 9New York State Emerging Infections Program, Albany; and 10Oregon Health Division, Portland
To determine the burden of illness caused by Escherichia coli O157 infections in populations in Foodborne Diseases Active Surveillance Network (FoodNet) surveillance areas, we initiated active, laboratory‐based surveillance and surveyed laboratories, physicians, and the general public regarding the factors associated with the diagnosis and surveillance of infection with E. coli O157. We evaluated survey responses and site‐specific incidence, outbreak, and demographic data during 1996–1999. A total of 1425 laboratory‐confirmed cases of E. coli O157 infection and 32 outbreaks were reported from the 5 original FoodNet sites. The average annual incidence ranged from 0.5 cases/100,000 population in Georgia to 4.4 cases/100,000 population in Minnesota. After excluding outbreak‐associated cases, the annual incidence of sporadic, laboratory‐confirmed E. coli O157 infections remained relatively stable during 1996–1999, with a range of 1.9–2.3 cases/100,000 population. Regional differences in incidence partly resulted from differing physician and laboratory practices and from site‐specific exposure factors (e.g., living on or visiting farms).
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Financial support: Centers for Disease Control and Prevention, National Center for Infectious Diseases; US Department of Agriculture, Food Safety and Inspection Service; and US Food and Drug Administration, Center for Food Safety and Applied Nutrition.
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Working group members are listed at the end of the text.



