Journal Article

Susceptibility of <i>Campylobacter hyointestinalis</i> subsp. <i>hyointestinalis</i> to antimicrobial agents and characterization of quinolone-resistant strains

Minna Laatu, Hilpi Rautelin and Marja-Liisa Hänninen

in Journal of Antimicrobial Chemotherapy

Published on behalf of British Society for Antimicrobial Chemotherapy

Volume 55, issue 2, pages 182-187
Published in print February 2005 | ISSN: 0305-7453
Published online February 2005 | e-ISSN: 1460-2091 | DOI: http://dx.doi.org/10.1093/jac/dkh537
Susceptibility of Campylobacter hyointestinalis subsp. hyointestinalis to antimicrobial agents and characterization of quinolone-resistant strains

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Objectives:

To study the susceptibility of Campylobacter hyointestinalis subsp. hyointestinalis to several antimicrobial agents and to investigate the mechanisms of nalidixic acid and ciprofloxacin resistance.

Methods:

The disc diffusion method was employed to study the susceptibility of 49 C. hyointestinalis subsp. hyointestinalis strains of reindeer and bovine origin to 12 different antimicrobial agents. In addition, the MICs of nalidixic acid and ciprofloxacin were determined. The nucleotide sequence of a 270 bp fragment of the gyrA gene was determined in ciprofloxacin-susceptible and -resistant strains. The effect of a multidrug efflux pump inhibitor Phe-Arg-β-naphthylamide (PAβN) on the MICs of ciprofloxacin and nalidixic acid was also studied.

Results:

The only decreased susceptibility for antimicrobial agents of this study was observed for sulphonamide compound and streptomycin (24% and 32% of the strains, respectively), and this phenomenon was observed exclusively in the bovine strains. In sequence studies, a Thr-86→Ile change was found in strains with MICs of ciprofloxacin of ≥ 64 mg/L, but this mutation was absent in strains with lower resistance levels. The use of PAβN did not affect the MIC of ciprofloxacin but decreased the MIC of nalidixic acid 2–4-fold.

Conclusions:

The Finnish C. hyointestinalis subsp. hyointestinalis strains are susceptible to a majority of the antimicrobials of veterinary importance. The mechanism of ciprofloxacin resistance at lower levels (≤32 mg/L) is not associated with a specific mutation in the quinolone resistance-determining region of the gyrA gene. Finally, there are distinct differences in the mechanisms of ciprofloxacin resistance compared with nalidixic acid resistance within the studied species.

Keywords: ciprofloxacin; nalidixic acid; efflux pumps; gyrA

Journal Article.  3613 words.  Illustrated.

Subjects: Medical Oncology ; Critical Care

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