Abstract
There have been only 2 reports of a large-scale foodborne outbreak arising from Salmonella enterica serotype Braenderup infection worldwide. On August 9, 2008, an outbreak originating in boxed lunches occurred in Okayama, Japan. We conducted a cohort study of 786 people who received boxed lunches from a particular catering company and collected 644 questionnaires (response rate: 82%). Cases were defined as those presenting with diarrhea (> 4 times in 24 h) or fever (> 38°C) between 12 am on August 8 and 12 am on August 14. We identified 176 cases (women/men: 39/137); younger children (aged <10 years) appeared to more frequently suffer severe symptoms. Three food items were significantly associated with higher risk of illness; tamagotoji (soft egg with mixed vegetables and meat) (relative risk (RR): 11.74, 95% confidence interval (CI): 2.98-46.24), pork cooked in soy sauce (RR: 3.17, 95% CI: 1.24-8.10), and vinegared food (RR: 4.13, 95% CI: 1.6010.63). Among them, only the RR of tamagotoji was higher when we employed a stricter case definition. Salmonella Braenderup was isolated from 5 of 9 sampled cases and 6 food handlers. It is likely that unpasteurized liquid eggs contaminated by Salmonella Braenderup and used in tamagotoji caused this outbreak.
| Original language | English |
|---|---|
| Pages (from-to) | 63-69 |
| Number of pages | 7 |
| Journal | Acta Medica Okayama |
| Volume | 65 |
| Issue number | 2 |
| Publication status | Published - 2011 |
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Keywords
- Boxed lunch
- Cohort study
- Foodborne diseases
- Salmonella Braenderup
- Unpasteurized liquid eggs
ASJC Scopus subject areas
- Medicine(all)
- Biochemistry, Genetics and Molecular Biology(all)
Cite this
Outbreak of Salmonella Braenderup infection originating in boxed lunches in Japan in 2008. / Mizoguchi, Yoshinori; Suzuki, Etsuji; Tsuchida, Hiroaki; Tsuda, Toshihide; Yamamoto, Eiji; Nakase, Katsumi; Doi, Hiroyuki.
In: Acta Medica Okayama, Vol. 65, No. 2, 2011, p. 63-69.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Outbreak of Salmonella Braenderup infection originating in boxed lunches in Japan in 2008
AU - Mizoguchi, Yoshinori
AU - Suzuki, Etsuji
AU - Tsuchida, Hiroaki
AU - Tsuda, Toshihide
AU - Yamamoto, Eiji
AU - Nakase, Katsumi
AU - Doi, Hiroyuki
PY - 2011
Y1 - 2011
N2 - There have been only 2 reports of a large-scale foodborne outbreak arising from Salmonella enterica serotype Braenderup infection worldwide. On August 9, 2008, an outbreak originating in boxed lunches occurred in Okayama, Japan. We conducted a cohort study of 786 people who received boxed lunches from a particular catering company and collected 644 questionnaires (response rate: 82%). Cases were defined as those presenting with diarrhea (> 4 times in 24 h) or fever (> 38°C) between 12 am on August 8 and 12 am on August 14. We identified 176 cases (women/men: 39/137); younger children (aged <10 years) appeared to more frequently suffer severe symptoms. Three food items were significantly associated with higher risk of illness; tamagotoji (soft egg with mixed vegetables and meat) (relative risk (RR): 11.74, 95% confidence interval (CI): 2.98-46.24), pork cooked in soy sauce (RR: 3.17, 95% CI: 1.24-8.10), and vinegared food (RR: 4.13, 95% CI: 1.6010.63). Among them, only the RR of tamagotoji was higher when we employed a stricter case definition. Salmonella Braenderup was isolated from 5 of 9 sampled cases and 6 food handlers. It is likely that unpasteurized liquid eggs contaminated by Salmonella Braenderup and used in tamagotoji caused this outbreak.
AB - There have been only 2 reports of a large-scale foodborne outbreak arising from Salmonella enterica serotype Braenderup infection worldwide. On August 9, 2008, an outbreak originating in boxed lunches occurred in Okayama, Japan. We conducted a cohort study of 786 people who received boxed lunches from a particular catering company and collected 644 questionnaires (response rate: 82%). Cases were defined as those presenting with diarrhea (> 4 times in 24 h) or fever (> 38°C) between 12 am on August 8 and 12 am on August 14. We identified 176 cases (women/men: 39/137); younger children (aged <10 years) appeared to more frequently suffer severe symptoms. Three food items were significantly associated with higher risk of illness; tamagotoji (soft egg with mixed vegetables and meat) (relative risk (RR): 11.74, 95% confidence interval (CI): 2.98-46.24), pork cooked in soy sauce (RR: 3.17, 95% CI: 1.24-8.10), and vinegared food (RR: 4.13, 95% CI: 1.6010.63). Among them, only the RR of tamagotoji was higher when we employed a stricter case definition. Salmonella Braenderup was isolated from 5 of 9 sampled cases and 6 food handlers. It is likely that unpasteurized liquid eggs contaminated by Salmonella Braenderup and used in tamagotoji caused this outbreak.
KW - Boxed lunch
KW - Cohort study
KW - Foodborne diseases
KW - Salmonella Braenderup
KW - Unpasteurized liquid eggs
UR - http://www.scopus.com/inward/record.url?scp=79955774801&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79955774801&partnerID=8YFLogxK
M3 - Article
C2 - 21519363
AN - SCOPUS:79955774801
VL - 65
SP - 63
EP - 69
JO - Acta Medica Okayama
JF - Acta Medica Okayama
SN - 0386-300X
IS - 2
ER -