Korean J Prev Med.  2002 Nov;35(4):295-304.

Epidemiologic Investigation on an Outbreak of Cholera in Gyeongsangbuk-do, Korea, 2001

• Lee JH
• Lim HS
• Lee K
• Kim JC
• Lee SW
• Go UY
• Yang BK
• Lee JK
• Kim MS

Abstract

OBJECTIVES
This study was carried out to investigate the cause, magnitude and transmission route of the cholera outbreak in 2001.
METHODS
The study population were those persons who ingested foods at the restaurant, were confirmed as cholera patients, had symptoms of diarrhea and served as workers at the restaurant. A questionnaire survey and microbiological examinations on the microbes isolated from rectal swabs were conducted. Of the cases, 316 food histories were surveyed by an analysis of the restaurant menu. RESUJLTS: There were 139 confirmed cases of cholera reported in Korea in 2001. Of these, 104 were related to the restaurant. By region, Gyeongsangbuk-do had the highest incidence with 91 cases. Of these 91 cases, 74 had ingested foods at the restaurant, 2 were employees and 3 were secondary infection cases within the families. The results of the odds ratio analysis of the 316 persons having ingested foods at the restaurant were as follows: sandwiches 5.07 (95% CI, 1.85-14.59), soybean curd 2.45 (95% CI, 1.09-5.56), noodles 2.34 (95% CI, 1.24-4.42), steamed squid 2.01 (95% CI, 1.17-3.47) and vinegared rice 1.82 (95% CI, 1.08-3.09). It was certain the restaurant in question was the cause of the 2001 outbreak.
CONCLUSIONS
We suspected that more than one restaurant employee contaminated foods served at the restaurant. In addition, eating raw fishes purchased at the Pohang Fisheries infected the employees of the restaurant. There is a possibility that these raw fishes were themselves contaminated by cholera bacilli in the sea.

Keyword

Cholera; Outbreaks; Epidemiologic studies; Restaurants; Fisheries

MeSH Terms

Acetic Acid
Cholera*
Coinfection
Decapodiformes
Diarrhea
Disease Outbreaks
Eating
Epidemiologic Studies
Fisheries
Fishes
Gyeongsangbuk-do*
Humans
Incidence
Korea*
Odds Ratio
Surveys and Questionnaires
Restaurants
Soybeans
Steam
Acetic Acid
Steam