In vitro antimicrobial susceptibility of Helcococcus kunzii and molecular analysis of macrolide and tetracycline resistance

被引:0
作者
A. Vergne
F. Guérin
R. Lienhard
A. Le Coustumier
C. Daurel
C. Isnard
N. Marty
C. Poyart
V. Cattoir
机构
[1] CH de Cahors,Laboratoire de Biologie
[2] CHU de Caen,Service de Microbiologie & CNR de la Résistance aux Antibiotiques
[3] Université de Caen Basse-Normandie,Service de Bactériologie
[4] EA4655 (équipe “Antibio-résistance”),Hygiène
[5] ADMED Microbiologie,Service de Bactériologie & CNR des Streptocoques
[6] CHU de Toulouse,undefined
[7] GH Cochin-Hôtel Dieu-Broca,undefined
[8] Assistance Publique-Hôpitaux de Paris,undefined
来源
European Journal of Clinical Microbiology & Infectious Diseases | 2015年 / 34卷
关键词
Cefotaxime; Levofloxacin; Linezolid; Antimicrobial Susceptibility; Teicoplanin;
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中图分类号
学科分类号
摘要
Thanks to the recent advent of matrix-assisted laser desorption/ionisation time-of-flight (MALDI-TOF) technology, Helcococcus kunzii is now easily identifiable and considered as an opportunistic pathogen. However, data about antimicrobial susceptibilities remain very limited. The aim of the study was, then, to assess its in vitro susceptibility to 18 antimicrobial agents and to investigate the genetic basis of macrolide and tetracycline resistance. Thirty-nine human clinical isolates of H. kunzii collected from 2008 to 2013 were studied, as well as the type strain ATCC 51366T. Minimum inhibitory concentrations (MICs) of penicillin G, amoxicillin, cefotaxime, imipenem, gentamicin, erythromycin, clindamycin, quinupristin–dalfopristin, ciprofloxacin, levofloxacin, tetracycline, tigecycline, vancomycin, teicoplanin, linezolid, daptomycin, cotrimoxazole and rifampin were determined by the microdilution method. Screening for macrolide [erm(A) including erm(TR), erm(B), erm(C), erm(F), erm(T), erm(X), msr(A) and mef(A)] and tetracycline [tet(L), tet(M) and tet(O)] resistance genes was performed, as well as the detection of mutations in 23S rRNA. Except for one strain resistant to cefotaxime, all strains were categorised as susceptible to β-lactams, glycopeptides, linezolid, daptomycin and tigecycline. Whereas ciprofloxacin and gentamicin exhibited limited activity, 95 % of strains were categorised as susceptible to levofloxacin. Concerning erythromycin, a bimodal distribution was observed, with 29 ‘wild-type’ strains (MICs from 0.25 to 2 mg/L) and 11 ‘resistant’ strains (MICs ≥256 mg/L), including ten harbouring erm(TR). Two isolates exhibited acquired tetracycline resistance (MICs of 16 mg/L) by the production of tet(M). This large study on the in vitro antimicrobial susceptibility of H. kunzii suggests that β-lactams (especially penicillins) should be preferred for the treatment.
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页码:2057 / 2061
页数:4
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