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Étude De La Résistance Aux Antibiotiques Des Entérocoques D’Origine Animale Du Québec

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Étude De La Résistance Aux Antibiotiques Des Entérocoques D’Origine Animale Du Québec Université de Montréal Étude de la résistance aux antibiotiques des entérocoques d’origine animale du Québec par Cindy-Love Tremblay GREMIP et CRIP Département de pathologie et microbiologie Faculté de médecine vétérinaire Thèse présentée à la Faculté de médecine vétérinaire en vue de l’obtention du grade de philosophiae doctor (Ph.D.) en sciences vétérinaires option microbiologie Août 2012 Cindy-Love Tremblay, 2012 ii RÉSUMÉ Les entérocoques font partie de la flore normale intestinale des animaux et des humains. Plusieurs études ont démontré que les entérocoques d’origine animale pouvaient représenter un réservoir de gènes de résistance aux antibiotiques pour la communauté humaine et animale. Les espèces Enterococcus faecalis et Enterococcus faecium sont importantes en santé publique; elles sont responsables d’environ 12% de toutes les infections nosocomiales aux États-Unis. Au Canada, les cas de colonisation et/ou d’infections à entérocoques résistants à la vancomycine ont plus que triplé de 2005 à 2009. Un total de 387 isolats E. faecalis et E. faecium aviaires, et 124 isolats E. faecalis porcins ont été identifiés et analysés pour leur susceptibilité aux antibiotiques. De hauts pourcentages de résistance envers les macrolides et les tétracyclines ont été observés tant chez les isolats aviaires que porcins. Deux profils phénotypiques prédominants ont été déterminés et analysés par PCR et séquençage pour la présence de gènes de résistance aux antibiotiques. Différentes combinaisons de gènes de résistance ont été identifiées dont erm(B) et tet(M) étant les plus prévalents. Des extractions plasmidiques et des analyses par hybridation ont permis de déterminer, pour la première fois, la colocalisation des gènes erm(B) et tet(M) sur un plasmide d’environ 9 kb chez des isolats E. faecalis porcins, et des gènes erm(B) et tet(O) sur un plasmide de faible poids moléculaire d’environ 11 kb chez des isolats E. faecalis aviaires. De plus, nous avons démontré, grâce à des essais conjugatifs, que ces plasmides pouvaient être transférés. Les résultats ont révélé que les entérocoques intestinaux aviaires et porcins, lesquels peuvent contaminer la viande à l’abattoir, pouvaient représenter un réservoir de gènes de résistance envers la quinupristine-dalfopristine, la bacitracine, la tétracycline et les macrolides. Afin d’évaluer l’utilisation d’un antisérum polyclonal SA dans l’interférence de la résistance à de fortes concentrations de bacitracine (gènes bcrRAB), lors d’un transfert conjugatif répondant aux phéromones, un isolat multirésistant E. faecalis aviaire a été sélectionné. Après induction avec des phéromones produites par la souche réceptrice E. faecalis JH2-2, l’agrégation de la souche donatrice E. faecalis 543 a été observée ainsi iii que des fréquences de transfert élevées en bouillon lors d’une courte période de conjugaison. Le transfert conjugatif des gènes asa1, traB et bcrRAB ainsi que leur colocalisation a été démontré chez le donneur et un transconjugant T543-1 sur un plasmide de 115 kb par électrophorèse à champs pulsé (PFGE) et hybridation. Une CMI de > 2 048 µg/ml envers la bacitracine a été obtenue tant chez le donneur que le transconjuguant tandis que la souche réceptrice JH2-2 démontrait une CMI de 32 µg/ml. Le séquençage des gènes asa1, codant pour la substance agrégative, et traB, une protéine régulant négativement la réponse aux phéromones, a révélé une association de cet élément génétique avec le plasmide pJM01. De plus, cette étude présente qu’un antisérum polyclonal SA peut interférer significativement dans le transfert horizontal d’un plasmide répondant aux phéromones codant pour de la résistance à de fortes doses de bacitracine d’une souche E. faecalis aviaire multirésistante. Des isolats cliniques E. faecium d’origine humaine et canine ont été analysés et comparés. Cette étude rapporte, pour la première fois, la caractérisation d’isolats cliniques E. faecium résistants à l’ampicilline (EFRA) d’origine canine associés à CC17 (ST17) au Canada. Ces isolats étaient résistants à la ciprofloxacine et à la lincomycine. Leur résistance envers la ciprofloxacine a été confirmée par la présence de substitutions dans la séquence en acides aminés des gènes de l’ADN gyrase (gyrA/gyrB) et de la topoisomérase IV (parC/parE). Des résistances élevées envers la gentamicine, la kanamycine et la streptomycine, et de la résistance envers les macrolides et les lincosamides a également été observées. La fréquence de résistance envers la tétracycline était élevée tandis que celle envers la vancomycine n’a pas été détectée. De plus, aucune résistance n’a été observée envers le linézolide et la quinupristine- dalfopristine. Les données ont démontré une absence complète des gènes esp (protéine de surface des entérocoques) et hyl (hyaluronidase) chez les isolats canins EFRA testés tandis qu’ils possédaient tous le gène acm (adhésine de liaison au collagène d’E. faecium). Aucune activité reliée à la formation de biofilm ou la présence d’éléments CRISPR (loci de courtes répétitions palindromiques à interespaces réguliers) n’a été identifiée chez les isolats canins EFRA. Les familles de plasmide rep6 and rep11 ont significativement été associées aux isolats d’origine canine. Les profils PFGE des isolats d’origine humaine et canine n'ont révélé aucune relation (≤ 80%). Ces résultats illustrent iv l'importance d'une utilisation judicieuse des antibiotiques en médecine vétérinaire afin d’éviter la dissémination zoonotique des isolats EFRA canins. Nous pensons que ces résultats contribueront à une meilleure compréhension des mécanismes de résistance aux antibiotiques et de leurs éléments mobiles ainsi qu’à de nouvelles stratégies afin de réduire le transfert horizontal de la résistance aux antibiotiques et des facteurs de virulence. Mots-clés : Enterococcus faecalis, Enterococcus faecium, résistance aux antibiotiques, plasmide, conjugaison répondant aux phéromones, antisérum polyclonal SA, virulence, commensal, clinique. v ABSTRACT Enterococci are part of normal intestinal gut flora of animals and humans. Many studies have shown that enterococci from animal origin could represent an antimicrobial resistance genes reservoir for the human community. The two species Enterococcus faecalis and Enterococcus faecium are important in public health; they are responsible for approximately 12% of all nosocomial infections in the United States. In Canada, cases of colonization and/or infections to vancomycin resistant enterococci have more than tripled from 2005 to 2009. A total of 387 poultry E. faecalis and E. faecium isolates, and 124 porcine E. faecalis isolates were identified and analyzed for their antibiotic susceptibilities. High percentages of resistance to macrolides and tetracyclines were found in both avian and porcine isolates. Two predominant phenotypic profiles were determined and analyzed by PCR and sequencing for the presence of antimicrobial resistance genes. Various combinations of antibiotic resistance genes were detected; erm(B) and tet(M) were the most common genes. For the first time, plasmid extraction and hybridization revealed colocalization of erm(B) and tet(M) on a plasmid of ~9 kb in porcine E. faecalis isolates, and of erm(B) and tet(O) on a low-molecular-weight plasmid of ~11 kb in poultry E. faecalis isolates. Furthermore, we demonstrated, through mating experiments, these plasmids could be transferred. Results indicate that the intestinal enterococci of healthy pigs and poultry, which can contaminate meat at slaughter, could be a reservoir for quinupristin-dalfopristin, bacitracin, tetracycline, and macrolide resistance genes. To assess the use of a polyclonal antiserum AS on the contact interference of a high level bacitracin resistant (bcrRAB genes) pheromone-responsive plasmid, a multiresistant E. faecalis isolate of poultry origin was selected. After induction with pheromones produced by the recipient strain E. faecalis JH2-2, clumping of the donor E. faecalis strain 543 was demonstrated as well as high transfer frequencies in short time broth mating. Conjugative transfer of asa1, traB and bcrRAB genes and their co- localization were also demonstrated in the donor strain and a transconjugant T543-1 on a plasmid band of 115 kb by PFGE and Southern blotting. A MIC to bacitracin of > 2 048 µg/ml was obtained for both strains 543 and T543-1 whereas the recipient strain JH2-2 demonstrated a MIC of 32 µg/ml. Sequencing of the asa1 gene encoding for an AS, and vi traB for a pheromone shutdown protein, confirmed the association of this genetic element to the pheromone-responsive plasmid related to pJM01. More significantly, this study presents the evidence that a polyclonal antiserum AS can significantly interfere with the horizontal transfer of a pheromone-responsive plasmid encoding high-level bacitracin resistance of a poultry multidrug resistant E. faecalis strain. Clinical isolates of E. faecium of human and canine origin were analyzed and compared. This report describes for the first time the characterization of canine clinical ampicillin-resistant E. faecium (AREF) isolates related to CC17 (ST17) in Canada. These isolates were resistant to ciprofloxacin and lincomycin. Resistance to ciprofloxacin was confirmed by amino acid substitutions in DNA gyrase (gyrA/gyrB) and topoisomerase IV (parC/parE) genes. High-level gentamicin, -kanamycin and - streptomycin resistances and macrolides resistance were also observed. The frequency of tetracycline resistance was high whereas vancomycin resistance was not detected. Also,
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