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Epidemiological Investigation of a Diarrhea Outbreak in a High School in Taipei County

並列摘要


Between October 4 and 6, 1995, dozens of students in a high school in Taipei County were sent to hospitals because of diarrhea, abdominal pain, and vomiting. According to the time of onset and distribution of cases, a cluster infection was suspected. Through questionnaires to all teachers, workers, and students, examination of specimens from patients, drinking water and food, and environmental surveillance, the common infection source was suspected to be the school lunch supplied on October 4. The results of analyzing questionnaires showed that, among the 1,4171 students, 336 had symptoms satisfying the definition of food poisoning, with an infection rate of 22.8%. Symptoms among cases included diarrhea (100%), abdominal cramping/pain (96.7%), and nausea/vomiting (41.1%). The incubation time of onset was between 1 to 73 hours with a median of 19 hours, and hence pathogens having long incubation periods were suspected. No pathogens could be identified in 103 anal swab specimens, 8 food specimens, and 10 environmental specimens. Squid potage from the lunch showed statistically significant correlation with the food poisoning. Age-adjusted risk was 1.40, with 95% confidence interval between 1.04 and 1.90.

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