JAC Advance Access originally published online on March 31, 2006
Journal of Antimicrobial Chemotherapy 2006 57(6):1215-1219; doi:10.1093/jac/dkl122
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Effect of human vicinity on antimicrobial resistance and integrons in animal faecal Escherichia coli
1 Laboratoire de Bactériologie, Hôpital Bichat-Claude Bernard AP-HP and EA3964, Université Paris 7 Denis Diderot, 46 rue Henri Huchard, 75018 Paris, France 2 INSERM U722 and Université Paris 7 Denis Diderot, UFR de Médecine Site Xavier Bichat, 16 rue Henri Huchard, 75018 Paris, France 3 Centre International de Recherches Médicales de Franceville (CIRMF), BP 769 Franceville, Gabon
Received 18 January 2006; returned 16 February 2006; revised 10 March 2006; accepted 14 March 2006
*Corresponding author. Tel: +33-1-44-85-61-56; Fax: +33-1-44-85-61-49; E-mail: denamur{at}bichat.inserm.fr
Objectives: To determine the level of antimicrobial resistance and the occurrence of class 1, 2 and 3 integrons in faecal Escherichia coli from several animal populations variously exposed to human contact.
Methods: A collection of 341 faecal E. coli isolates was constituted from several animal populations subject to various degrees of exposure to humans: 18 animals never exposed to humans (living in the Antarctic or Gabon), 71 wild animals living in a low human density area (mountainous region of the Pyrenees, France), 61 wild animals living in a higher human density area (Fontainebleau forest near Paris, France), and 128 extensively reared farm animals and 42 pet dogs, both living in the Pyrenees. Resistance to antimicrobial agents was determined by the method of disc diffusion and quantified using the resistance score of BE Murray, JJ Mathewson, HL DuPont, CD Ericsson and RR Reves (Antimicrobial Agents and Chemotherapy 1990; 34: 515–18). Integrons were characterized by triplex real-time PCR and sequencing. The absence of epidemiologic clones was confirmed by PCR-based methods.
Results: A gradient of resistance ranging from absence to high prevalence (resistance score of 18.7%) and a gradual increase in the prevalence of class 1 integrons (from 0% to 16%), both correlated with the increase in exposure to humans, were observed. In wild animals with little contact with humans, resistance, when present, was not mediated by integrons.
Conclusions: Our findings firmly establish that the current prevalence of antimicrobial resistance found in animal faecal bacteria, as well as the prevalence of integrons, is clearly anthropogenic. The presence of integrons may constitute an adaptive process to environments whose antimicrobial pressure exceeds a certain threshold.
Keywords: selective pressure , environment , wild , domestic , pets
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