OBJECTIVES This study aimed to reveal the epidemiologic characteristics of the outbreak of gastroenteritis caused by Salmonella enterica serovar Thompson in Busan Metropolitan City and to identify points for improvement to prevent of food-borne disease outbreak.
METHODS
This was a case-control study. The control group comprised asymptomatic students in the same classes of the cases. The presence or absence of symptoms, ingestion of each food provided by school meal service, and commonly ingested foods in addition to those foods in meal service were investigated. Moreover, specimens collected from rectal swab, preserved foods, and environmental surface were tested.
RESULTS
Of the 6,092 subjects, 1,111 (1,083 students, 22 school personnel, and 6 foodservice employees) were included in the case group; this corresponded to an 18.4% attack rate. Symptoms included diarrhea (n=1,051, 94.6%), abdominal pain (n=931, 83.8%), febrile sensation (n=502, 45.2%), and vomiting (n=275, 24.8%). The epidemic curves of each 10 schools were unimodal. Investigation of food intake showed a significantly high odds ratio for chocolate cake in 5 out of the 10 schools. Laboratory test detected Salmonella enterica serovar Thompson both in rectal swab specimens of 9 schools and in collected preserved chocolate cakes of 9 schools. Pulsed-field gel electrophoresis test result showed that Salmonella enterica seorvar Thompson isolated from human and foods were the same.
CONCLUSIONS
The source of infection for the Salmonella enterica serovar Thompson outbreak in the 10 schools of Busan Metropolitan City is chocolate cake. Traceback investigation for origin of contaminated food in food-borne disease outbreak and safety control during food production should be more enhanced.
Summary
Korean summary
이 연구는 2018년 9월 부산광역시 10개 학교에서 급식으로 제공된 초콜릿 케익으로 인해 발생한 살모넬라 톰슨 감염증 대규모 유행의 역학 조사 결과이다. 학교 급식과 같은 대규모 집단급식은 원재료에서 급식 제공까지 안전하게 관리되어야 하며 식품매개감염병 집단 발생 역학조사에 있어 오염원에 대한 체계적 역추적 조사와 기관 간 협업의 중요성을 강조하였다.
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The Korea Centers for Disease Control and Prevention (KCDC) operate infectious disease surveillance systems to monitor national disease incidence. Since 1954, Korea has collected data on various infectious diseases in accordance with the Infectious Disease Control and Prevention Act. All physicians (including those working in Oriental medicine) who diagnose a patient with an infectious disease or conduct a postmortem examination of an infectious disease case are obliged to report the disease to the system. These reported data are incorporated into the database of the National Infectious Disease Surveillance System, which has been providing web-based real-time surveillance data on infectious diseases since 2001. In addition, the KCDC analyzes reported data and publishes the Infectious Disease Surveillance Yearbook annually.
Summary
Korean summary
감염병웹통계(http://is.cdc.go.kr)에서는 전수감시 대상 54종 감염병에 대한지역별, 성별, 연령별, 감염지역별, 기간별, 전년대비 주간 발생현황 등 실시간 기간 검색이 가능하며, 검색된 통계를 표 또는 다양한 그래프로 볼 수 있으며, 또한 이러한 자료들은 엑셀로 다운로드하여 사용이 가능하다. 표본감시 대상 24종 감염병의 통계도 제공되고 있다.
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