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Epidemiologic Investigation
- Salmonellosis outbreaks linked to eggs at 2 gimbap restaurants in Korea
- Jun Suk Eun, Joohyun Han, Ji-Hyun Lim, Eunkyung Shin, Junyoung Kim, Da-Jung Ko, Jaeil Yoo, Sungil Kim, Jin Sook Kim, Jung Sub Park, Ji-Hyuk Park
- Epidemiol Health. 2024;46:e2024036. Published online March 7, 2024
- DOI: https://doi.org/10.4178/epih.e2024036
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Abstract
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Supplementary Material -
AbstractOBJECTIVES
Salmonellosis outbreaks occurred at 2 restaurants 2 days apart, and an epidemiological investigation was conducted to determine whether the outbreaks were connected.METHODSCase studies were conducted for both outbreaks. Stool samples were collected from individuals, and food samples were collected from the restaurants. Pulsed-field gel electrophoresis (PFGE) and whole-genome sequencing analyses were performed on outbreak-related <i>Salmonella enterica</i> serovar Enteritidis (<i>Salmonella Enteritidis</i>) isolates. Traceback investigations were also conducted for the ingredients from gimbap restaurants A and B.RESULTSIn total, 106 people from gimbap restaurant A and 5 from gimbap restaurant B met the case definition. Salmonella Enteritidis was detected in samples from 2 food handlers, 22 patients, and 1 food (iceberg lettuce) at gimbap restaurant A and from 1 patient at gimbap restaurant B. According to PFGE, all isolates were identified as SEGX01.089. The molecular typing of all isolates showed the same pattern, and the genetic distance was close according to phylogenetic analysis. Eggs were the only food ingredient that was supplied to both gimbap restaurants.CONCLUSIONSThe outbreaks were caused by <i>Salmonella</i> Enteritidis, and the source of infections was suspected to be contaminated eggs. To prevent foodborne outbreaks of <i>Salmonella</i>, restaurants should heat eggs sufficiently, and egg farms need to establish management systems that prevent <i>Salmonella</i> infections. -
SummaryKorean summary
동일한 도시의 두 식당에서 2일 간격으로 살모넬라감염증 유행이 발생하여, 원인을 확인하고 두 유행 간에 연관이 있는지를 규명하기 위해 역학조사를 시행하였다. 병원체에 대한 유전자형 분석과 식재료 역추적조사 결과를 바탕으로 두 유행은 Salmonella Enteritidis에 의해 발생하였고, 감염원은 동일한 농장에서 공급된 오염된 계란으로 추적하였다.Key Message
Salmonellosis outbreaks occurred at 2 restaurants in the same city 2 days apart, and epidemiological investigations were conducted to identify the causes and determine whether the outbreaks were connected. Based on the genetic characterization of the pathogens and traceback investigation of the food ingredients, the outbreaks were caused by Salmonella Enteritidis and the source of infection was traced to contaminated eggs, which were supplied from the same farm.
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