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Epidemiologic Investigation Salmonellosis outbreaks linked to eggs at 2 gimbap restaurants in Korea
Jun Suk Eun1,2orcid , Joohyun Han3orcid , Ji-Hyun Lim4orcid , Eunkyung Shin3orcid , Junyoung Kim3orcid , Da-Jung Ko4orcid , Jaeil Yoo3orcid , Sungil Kim5orcid , Jin Sook Kim5orcid , Jung Sub Park5orcid , Ji-Hyuk Park6orcid
Epidemiol Health 2024;46e2024036-0
DOI: https://doi.org/10.4178/epih.e2024036
Published online: March 7, 2024
1Disease Management Division, Deogyang-gu Public Health Center, Goyang, Korea
2Department of Epidemiology and Health Promotion, Graduate School of Public Health, Yonsei University, Seoul, Korea
3Division of Bacterial Diseases, Bureau of Infectious Disease Diagnosis Control, Korea Disease Control and Prevention Agency, Cheongju, Korea
4Microbiological Inspection Team, Gyeonggi Province Institute of Health and Environment in North Branch, Uijeongbu, Korea
5Foodborne Disease Prevention & Surveillance Division, Food and Consumer Safety Bureau, Ministry of Food and Drug Safety, Cheongju, Korea
6Department of Preventive Medicine, Dongguk University College of Medicine, Gyeongju, Korea
Corresponding author:  Ji-Hyuk Park,
Email: skeyd@naver.com
Received: 10 October 2023   • Accepted: 10 January 2024
Jun Suk Eun and Joohyun Han contributed equally to this study as co-first authors.
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Salmonellosis outbreaks occurred at 2 restaurants 2 days apart, and an epidemiological investigation was conducted to determine whether the outbreaks were connected.
Case 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.
In 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.
The 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.

Epidemiol Health : Epidemiology and Health