[Epidemiologic investigation on sporadic occurrence of shigellosis in a subcounty of Cheongwon County in Chungbuk Province in 2003].
OBJECTIVE
This study was undertaken to investigate the source of infection and mode of transmission of shigellosis, which occurred sporadically among residents and students in a subcounty of Cheongwon county, Chungbuk province, Korea, from June 4 to July 3 2003.


METHODS
692 subjects completed a questionnaire and provided a swab for microbiological examinations and 7 environmental specimens were examined for bacterial organisms. PFGE (pulsed-field gel electrophoresis) and fingerprinting were performed to find the genetic relationship among the temporally associated sporadic isolates.


RESULTS
A total of 29 patients had symptoms consistent with the case definition, with 13 confirmed and 16 suspected cases. The frequency of diarrhea was 6 times or more a day (80.8%), with a duration of 1 to 4 days (88.5%) in most cases. The most common symptoms accompanying the diarrhea were fever (80.9%) followed by abdominal pain (76.9%), headache (65.4%), chill (61.5%), vomiting (46.2%) and tenesmus (15.4%). The epidemic curve was characteristic of a person-to-person transmission. The PFGE and fingerprinting demonstrated identical or similar DNA patterns among the 3 Shigella sonnei isolates (A51, A53 and A61 types) found in this outbreak.


CONCLUSIONS
A genetically identical strain of S. sonnei was estimated to be the cause of this outbreak, and the mode of transmission was most likely person-to-person.
Lee
Yong-Jae
YJ
Division of Epidemic Intelligence Service, Korea Center for Disease Control and Prevention.
Hwang
Ue-Kyoung
UK
Kim
Jong-Suk
JS
Kim
Jun-Young
JY
Koo
Ja-Seol
JS
Lee
Bok-Kwon
BK
Kang
Jong-Won
JW
D004196:Disease Outbreaks; D004405:Dysentery, Bacillary / Q000175:diagnosis / Q000453:epidemiology* / Q000635:transmission; D006801:Humans; D007723:Korea / Q000453:epidemiology; D011159:Population Surveillance; D012760:Shigella; D011795:Surveys and Questionnaires