title: Presence and characterization of Campylobacter jejuni in organically raised chickens in Quebec.
abstract: The objective of this study was to estimate the presence of the important foodborne pathogen Campylobacter jejuni in organically raised chickens in the province of Quebec. The recovered isolates were further characterized for their antimicrobial resistance profile, autoagglutination property and chemotaxis. Antimicrobial resistance was evaluated using agar dilution for: tetracycline, erythromycin, chloramphenicol, ciprofloxacin, gentamicin, nalidixic acid, clindamycin, ampicillin, azithromycin, bacitracin, and ceftiofur. Autoagglutination was measured by monitoring optical density changes in a bacterial suspension after 3 h of incubation at room temperature. Chemotaxis was evaluated after a contact time of 3 h between isolates and mucin, using a quantitative protocol. A total of 10 lots of chickens was sampled in August and September 2009; half of them were positive for the presence of C. jejuni. Antimicrobial resistance was found only for tetracycline (44%), erythromycin (6%), azithromycin (6%) and clindamycin (2%). Variation was observed in the minimum inhibitory concentrations (MICs) for ceftiofur and bacitracin, for which C. jejuni possess intrinsic resistance. Autoagglutination and chemotaxis varied among isolates and lot-level differences in these were observed. Autoagglutination and chemotaxis levels appeared as independent isolate properties. Further monitoring and characterization of isolates originating from organic chickens is of interest since this type of production might represent another source of exposure of consumers to a variety of the foodborne pathogen C. jejuni.
authors.affiliation: Université de Montréal, département de microbiologie et de pathologie, St-Hyacinthe, Québec.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Thibodeau
authors.forename: Philippe
authors.initials: P
authors.lastname: Fravalo
authors.forename: Sylvette
authors.initials: S
authors.lastname: Laurent-Lewandowski
authors.forename: Evelyne
authors.initials: E
authors.lastname: Guévremont
authors.forename: Sylvain
authors.initials: S
authors.lastname: Quessy
authors.forename: Ann
authors.initials: A
authors.lastname: Letellier
mesh_terms: D000822:Animal Husbandry; D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002169:Campylobacter Infections / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*; D016123:Campylobacter jejuni / Q000145:classification / Q000187:drug effects / Q000302:isolation & purification* / Q000502:physiology; D002633:Chemotaxis; D002645:Chickens; D024881:Drug Resistance, Bacterial; D008826:Microbial Sensitivity Tests; D011201:Poultry Diseases / Q000453:epidemiology / Q000382:microbiology*; D011792:Quebec / Q000453:epidemiology
chemical_list: D000900:Anti-Bacterial Agents