Epidemiological Relationship of Enterotoxigenic Escherichia coli and Enteroaggregative E. coli Isolated from Patients with Diarrhea in Seoul.
- Author:
Younghee JIN
1
;
Hyunjung SEUNG
;
Younghee OH
;
Jihun JUNG
;
Sujin JEON
;
Jaekyoo LEE
;
Changkyu KIM
;
Sungmin CHOI
;
Youngzoo CHAE
Author Information
- Publication Type:Original Article
- Keywords: Enterotoxigenic E. coli (ETEC); Enteroaggregative E. coli (EAEC); Antimicrobial resistance; PFGE
- MeSH: Ampicillin; Anti-Bacterial Agents; Diarrhea; Disease Outbreaks; Electrophoresis, Gel, Pulsed-Field; Enterotoxigenic Escherichia coli; Escherichia coli; Foodborne Diseases; Humans; Nalidixic Acid; Phenotype; Tetracycline; Ticarcillin
- From:Journal of Bacteriology and Virology 2013;43(1):37-44
- CountryRepublic of Korea
- Language:Korean
- Abstract: Of total 1,438 specimens of patients with diarrhea in Seoul, 2011, 217 samples (15%) were found pathogenic Escherichia coli that included 192 strains (89%) of enterotoxigenic E. coli (ETEC) and enteroaggregative E. coli (EAEC). The highest isolation rate for ETEC and EAEC was found in August and September. Sixty two pathogenic E. coli strains (34 ETEC and 28 EAEC strains) were selected from 175 strains (94 ETEC and 81 EAEC strains) isolated in August and September. Of 94 strains characterized for ETEC phenotype, 76 (81%) expressed heat-stable toxin (ST) only. Antimicrobial susceptibility test was carried out by using sixteen types of antibiotics. A high level of antimicrobial resistance to tetracycline (57%), ampicillin and ticarcillin (54%) was observed among EAEC isolates while the highest resistance rate of ETEC was found for nalidixic acid (47%), followed by tetracycline (32%). As to the antimicrobial susceptibility test, EAEC showed the complicated multi-drug resistant patterns in which the resistance was higher than ETEC. Pulsed-field gel electrophoresis (PFGE) was carried out to examine the genetic relatedness among ETEC and EAEC isolates. Except for 11 strains, 51 strains were divided by eight pulsotypes. In PFGE analysis, isolates from foodborne disease outbreaks in August and September 2011 showed close relation.
