Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Genetic Properties and Antimicrobial Resistance of Campylobacter jejuni Isolates from Diarrhea Patients in Gyeonggi-do

경기도내에서 분리한 캠필로박터 제주니균의 유전적특성 및 항생제내성 연구

  • Hur, Eun-Seon (Team of Microbiology, Gyeonggi Institute of Health and Environment) ;
  • Park, Po-Hyun (Team of Microbiology, Gyeonggi Institute of Health and Environment) ;
  • Kim, Jong-Hwa (Team of Microbiology, Gyeonggi Institute of Health and Environment) ;
  • Son, Jong-Sung (Team of Microbiology, Gyeonggi Institute of Health and Environment) ;
  • Yun, Hee-Jeong (Team of Microbiology, Gyeonggi Institute of Health and Environment) ;
  • Lee, Yea-Eun (Team of Microbiology, Gyeonggi Institute of Health and Environment) ;
  • Choi, Yun-Sook (Team of Microbiology, Gyeonggi Institute of Health and Environment) ;
  • Yoon, Mi-Hye (Team of Microbiology, Gyeonggi Institute of Health and Environment) ;
  • Lee, Jong-Bok (Team of Microbiology, Gyeonggi Institute of Health and Environment)
  • 허은선 (경기도보건환경연구원 미생물팀) ;
  • 박포현 (경기도보건환경연구원 미생물팀) ;
  • 김종화 (경기도보건환경연구원 미생물팀) ;
  • 손종성 (경기도보건환경연구원 미생물팀) ;
  • 윤희정 (경기도보건환경연구원 미생물팀) ;
  • 이예은 (경기도보건환경연구원 미생물팀) ;
  • 최연숙 (경기도보건환경연구원 미생물팀) ;
  • 윤미혜 (경기도보건환경연구원 미생물팀) ;
  • 이정복 (경기도보건환경연구원 미생물팀)
  • Received : 2013.05.06
  • Accepted : 2013.07.04
  • Published : 2013.09.30
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Abstract

Campylobacter jejuni is one of important food-borne pathogens causing human gastroenteritis. We isolated 42 strains of C. jejuni from diarrhea patients and 4 food-poisoning outbreaks in 2010, Gyeonggi-do. In this study, 42 strains were tested for genetic characteristics, the serotype distribution and antimicrobial resistant rate. The presence of hipO (100%), cdtB (100%), and mutated gyrA (95.2%) genes was detected in C. jejuni by polymerase chain reaction (PCR). Detection of mutated gyrA gene correlated with ciprofloxacin resistance. Forty isolates had mutated gyrA gene and were actually resistant to ciprofloxacin. Furthermore, comparing the gyrA DNA sequence data, ciprofloxacin-resistant isolates had a mutation of the DNA sequence from ACA (threonine) to ATA (isoleucine). But 41 strains (97.6%) of patient isolates were susceptible to erythromycin and azithromycin. A total of 35.7% among 42 C. jejuni isolates were identified into 4 different serotypes. The serotype distribution of C. jejuni strains were shown to be HS2(B), HS3(C), HS4(D), HS19(O). To investigate the genotypes of C. jejuni isolated in Gyeonggi province, repetitive sequence polymerase chain reaction (rep-PCR) analysis and SmaI-digested pulsed-filed gel electrophoresis (PFGE) profile analysis were performed. From the PFGE analysis of 42 C. jejuni strains, 12 clusters of PFGE profile were obtained. On the other hand, 11 clusters of rep-PCR profile were obtained from 42 strains of C. jejuni.

Campylobacter jejuni는 사람에서 매우 중요한 식중독 원인균의 하나이며, 2010년 경기도내 병원을 내원한 설사 환자와 4번의 식중독 outbreak에서 42균주를 분리하였다. 본 연구에서는 분리된 C. jejuni 42균주의 유전적 특성과 혈청형, 항균제 내성율을 분석하였다. hipO 종특이 유전자(100%), cdtB 독소 유전자(100%)가 검출되었고, gyrA 돌연변이 유전자(95.2%)가 PCR 실험결과 검출되었다. gyrA 돌연변이 유전자는 ciprofloxacin 내성과 연관이 깊으며, 디스크 확산법에 의해 실험한 결과 gyrA 돌연변이 유전자가 검출된 40균주(95.2%)에서 실제 ciprofloxacin에 대해 내성을 보였다. 분리된 42균주 C. jejuni에 대한 gyrA 유전자의 염기서열을 분석한 결과 ciprofloxacin에 내성을 가진 40균주에서 아미노산 서열이 ACA (트레오닌)에서 ATA (이소루신)으로 돌연변이 되어있음을 확인하였다. 하지만 대체 치료제인 erythromycin과 azithromycin에 대해서는 97.6% (41균주) 감수성을 보였다. 또한 C. jejuni의 혈청형을 분석한 결과 4가지 타입으로 분류되었는데, HS2(B), HS3(C), HS4(D), HS19(O)로 확인되었다. 도내에서 분리한 C. jejuni 42균주의 유전형을 rep-PCR과 PFGE로 확인한 결과 PFGE에 의해서는 12 cluster, rep-PCR에 의해서는 11 cluster의 유전형으로 구분되었다.

Keywords

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