Journal of Preventive Medicine and Public Health

The Korean Society for Preventive Medicine (대한예방의학회)
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Epidemiologic Investigation on an Outbreak of Salmonellosis in Yeongcheon-si, 2004

2004년 영천시 D 초등학교에서 집단 발생한 살모넬라증

  • Min, Young-Sun (Department of Preventive Medicine, College of Medicine, Dongguk University) ;
  • Lee, Hwan-Seok (Public Health & Sanitation Division, Gyeongsangbuk-do) ;
  • Lim, Hyun-Sul (Department of Preventive Medicine, College of Medicine, Dongguk University)
  • 민영선 (동국대학교 의과대학 예방의학교실) ;
  • 이환석 (경상북도 보건위생과) ;
  • 임현술 (동국대학교 의과대학 예방의학교실)
  • Published : 2005.12.01
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Abstract

Objectives : An outbreak of salmonellosis occurred among the student s and staff of D primary school in Yeongcheon-si, 2004. This investigation was carried out to prevent any recurrence of this outbreak and to study the infection source and transmission of the salmonellosis. Methods : The authors conducted a questionnaire survey among 1,205 students and staff members from D primary school about the ingestion of the school lunch and drinking water, and the manifestation of their symptoms. The author examined rectal swabs, the tap water and microorganism cultures, and we also investigated the dining facility and water supply facility. Results : The diarrheal cases were defined as the confirmed cases or the persons who had diarrhea more than one time with symptoms such as fever, vomiting and tenesmus. The diarrheal attack rate was 28.0%. Ingestion of fried bean curd with egg had a significantly high association with the diarrheal attack rate (p<0.05), and the relative risk of the fried bean curd with egg was 10.68 (95% CI=3.88-29.41), as was determined by logistic regression analysis. The bacterial counts in the tap water of the food preparation room and toilet (first floor) exceeded the maximum permissible counts. S. Enteritidis bacteria were only cultured from the fried bean curd with egg of all the supplied foods on September 3, 2004. Conclusions : The major cause of salmonellosis was presumed to be the contaminated bean curd via contaminated tap water due to a water leak of a school water pipe. This contaminated bean curd was under prepared, which allowed the S. Enteritidis to survive and multiply prior to its ingestion.

Keywords

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