Epidemiological relationships of Campylobacter jejuni strains isolated from humans and chickens in South Korea

• Published in: The journal of microbiology 2017, 55(1), , pp.13-20
• Main Authors: Oh, Jae-Young, Kwon, Yong-Kuk, Wei, Bai, Jang, Hyung-Kwan, Lim, Suk-Kyung, Kim, Cheon-Hyeon, Jung, Suk-Chan, Kang, Min-Su
• Format: Article
• Language: English
• Subjects: Animals; Anti-Bacterial Agents - pharmacology; Antimicrobial agents; Bacterial Typing Techniques; Biomedical and Life Sciences; Campylobacter; Campylobacter Infections - epidemiology; Campylobacter Infections - microbiology; Campylobacter Infections - transmission; Campylobacter jejuni; Campylobacter jejuni - classification; Campylobacter jejuni - drug effects; Campylobacter jejuni - genetics; Campylobacter jejuni - isolation & purification; Chickens; Chickens - microbiology; Ciprofloxacin - pharmacology; Cloning; Disease; DNA, Bacterial - genetics; Drug Resistance, Multiple, Bacterial; Electrophoresis, Gel, Pulsed-Field; Epidemics; Farms; Food contamination; Food contamination & poisoning; Foodborne Diseases - microbiology; Genotype; Health risks; Humans; Life Sciences; Microbial Ecology and Environmental Microbiology; Microbial Sensitivity Tests; Microbiology; Multilocus Sequence Typing; Poisoning; Polymerase Chain Reaction; Poultry; Poultry farming; Poultry production; Public health; Quarantine; Republic of Korea - epidemiology; Tetracycline - pharmacology; Veterinary medicine; Virulence; Virulence - genetics; 생물학
• ISSN: 1225-8873; 1976-3794
• DOI: 10.1007/s12275-017-6308-8

Thirty-nine human isolates of Campylobacter jejuni obtained from a national university hospital during 2007–2010 and 38 chicken isolates of C. jejuni were collected from poultry farms during 2009–2010 in South Korea were used in this study. Campylobacter genomic species and virulence-associated genes were identified by PCR. Pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST) were performed to compare their genetic relationships. All isolates were highly resistant to ciprofloxacin, nalidixic acid, and tetracycline. Of all isolates tested, over 94% contained seven virulence associated genes ( flaA, cadF, racR, dnaJ, cdtA, cdtB , and cdtC ). All isolates were classified into 39 types by PFGE clustering with 90% similarity. Some chicken isolates were incorporated into some PFGE types of human isolates. MLST analysis for the 39 human isolates and 38 chicken isolates resulted in 14 and 23 sequence types (STs), respectively, of which 10 STs were new. STs overlapped in both chicken and human isolates included ST-21, ST-48, ST-50, ST-51, and ST-354, of which ST-21 was the predominant ST in both human and chicken isolates. Through combined analysis of PFGE types and STs, three chicken isolates were clonally related to the three human isolates associated with food poisoning (VII-ST-48, XXII-ST-354, and XXVIII-ST-51). They were derived from geographically same or distinct districts. Remarkably, clonal spread of food poisoning pathogens between animals and humans was confirmed by population genetic analysis. Consequently, contamination of campylobacters with quinolone resistance and potential virulence genes in poultry production and consumption may increase the risk of infections in humans.