Outbreak of Shiga Toxin–Producing Escherichia coli O111:H8 Infections among Attendees of a High School Cheerleading Camp
1Foodborne and Diarrheal Diseases Branch and 2Biostatistics and Information Management Branch, Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, and 3Epidemic Intelligence Service, Epidemiology Program Office, Centers for Disease Control and Prevention, Atlanta, Georgia; and 4Infectious Disease Epidemiology and Surveillance Division and 5Bureau of Laboratories, Microbiological Services Division, Texas Department of Health, Austin
Few US clinical laboratories screen stool specimens for Shiga toxin–producing Escherichia coli (STEC) other than E. coli O157. An outbreak of STEC O111:H8 infections indistinguishable from E. coli O157:H7 at a youth camp highlights the need to improve non‐O157 STEC surveillance. Interviews of 521 (80%) of 650 attendees revealed 55 (11%) were ill; 2 developed hemolytic‐uremic syndrome. Illness was associated with consuming salad during the camp’s first lunch meal (hazard ratio [HR], 4.68;
), consuming ice provided in barrels on the camp's final day (HR, 3.41;
), eating cob corn (HR, 3.22;
), and eating a dinner roll (HR, 2.82;
). Cultures of 2 of 11 stools yielded E. coli O111:H8. Results of serologic testing and additional stool cultures demonstrated no evidence of infection with other bacterial pathogens, including E. coli O157, and supported infection with E. coli O111. Clinical laboratories should routinely screen suspect specimens for non‐O157 STEC and should serotype and report Shiga‐positive isolates.
Received 25 April 2003; accepted 26 August 2003; electronically published 22 December 2003.
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Presented in part: 37th Annual Meeting of the Infectious Disease Society of America, Philadelphia, PA, 18–21 November 1999 (abstract 727); and 49th Annual Epidemic Intelligence Service Conference, Atlanta, GA, 24–28 April 2001.



