Phylogenetic Diversity and Antimicrobial Resistance of <i>Campylobacter coli</i> from Humans and Animals in Japan

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  • Asakura Hiroshi
    Division of Biomedical Food Research, National Institute of Health Sciences
  • Sakata Junko
    Laboratory of Bacteriology, Department of Microbiology, Osaka Institute of Public Health
  • Nakamura Hiromi
    Laboratory of Microbiology, Department of Microbiology, Osaka Institute of Public Health
  • Yamamoto Shiori
    Division of Biomedical Food Research, National Institute of Health Sciences
  • Murakami Satoshi
    Department of Animal Hygiene, Tokyo University of Agriculture

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  • Phylogenetic Diversity and Antimicrobial Resistance of Campylobacter coli from Humans and Animals in Japan

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Abstract

<p>The phylogenetic diversity and antimicrobial resistance (AMR) of Campylobacter coli from humans and animals in Japan between 2008 and 2014 were investigated. A total of 338 foodborne campylobacterioses were reported in Osaka, and C. coli was isolated from 38 cases (11.2%). In the present study, 119 C. coli strains (42 from humans, 25 each from poultry, cattle, and swine, and 2 from wild mallard) were examined by multilocus sequence typing (MLST). MLST assigned 36 sequence types (STs), including 14 novel STs; all human strains and 91% of animal strains (70/77) were assigned to the ST-828 clonal complex. The predominant human ST was ST-860 (18/42, 43%), followed by ST-1068 (8/42, 19%); these STs were also predominant in poultry (ST-860, 9/25, 36%) and cattle (ST-1068, 18/25, 72%). ST-1562 was only predominant in swine (11/25, 44.0%). Swine strains showed the greatest resistance to erythromycin (EM; 92.0%), while EM resistance was only found in 2 out of the 42 human strains examined (4.8%). All EM-resistant swine strains (n=15) exhibited a common point mutation in the 23S rRNA sequence (A2085G), and the tetO gene was detected in 22 out of the 23 TET-resistant swine strains. A whole genome sequencing analysis of four representative swine ST-1562 strains revealed abundant AMR-associated gene clusters in their genomes, suggesting horizontal gene transfer events during host adaptation. This is the first study to demonstrate the phylogenetic diversity and AMR profiles of C. coli in Japan. The present results suggest that poultry and cattle are major reservoirs, improving our knowledge on the epidemiological and ecological traits of this pathogen.</p>

Journal

  • Microbes and Environments

    Microbes and Environments 34 (2), 146-154, 2019

    Japanese Society of Microbial Ecology / Japanese Society of Soil Microbiology / Taiwan Society of Microbial Ecology / Japanese Society of Plant Microbe Interactions / Japanese Society for Extremophiles

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