title: Genotype dynamics of Campylobacter jejuni in a broiler flock.
abstract: We investigated the genotype diversity and dynamics of Campylobacter in a commercial broiler flock during rearing and slaughter. In total, 220 Campylobacter jejuni isolates collected on four sampling occasions during rearing and from routine sampling during slaughter were subtyped by SmaI macrorestriction and pulsed-field gel electrophoresis, PFGE. Eight different SmaI types were found. During rearing, a subsequent addition of genotypes occurred, with two SmaI types found at 2 weeks of age and six types on the day before slaughter. All types that were detected in more than one isolate were also found on all succeeding sampling occasions, including the slaughter sampling. Two new types were found in the slaughter samples. In two-thirds of the individual birds sampled the day before slaughter, more than one SmaI type were found, although there was a clear tendency for dominance of one type in individual birds. Our results show that multiple genotypes of C. jejuni may be present in a commercial broiler flock during rearing and even in gastrointestinal tracts of individual birds. Both recurring environmental exposure and genetic changes within the population may explain the genotype diversity. Although the distribution of genotypes varied between different sampling occasions, we found no indication that any subtype excluded another during the rearing of the broiler flock.
authors.affiliation: Division of Food Hygiene and Bacteriology, Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, Box 7009, S-750 07 Uppsala, Sweden. helena.hook@bvf.slu.se
authors.forename: Helena
authors.initials: H
authors.lastname: Höök
authors.forename: Mohammed Abdel
authors.initials: MA
authors.lastname: Fattah
authors.forename: Henrik
authors.initials: H
authors.lastname: Ericsson
authors.forename: Ivar
authors.initials: I
authors.lastname: Vågsholm
authors.forename: Marie-Louise
authors.initials: ML
authors.lastname: Danielsson-Tham
mesh_terms: D000818:Animals; D002169:Campylobacter Infections / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*; D016123:Campylobacter jejuni / Q000235:genetics* / Q000302:isolation & purification; D002432:Cecum / Q000382:microbiology; D002645:Chickens; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism; D016521:Electrophoresis, Gel, Pulsed-Field / Q000662:veterinary; D005767:Gastrointestinal Diseases / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*; D014644:Genetic Variation / Q000235:genetics; D005838:Genotype; D007091:Image Processing, Computer-Assisted; D011201:Poultry Diseases / Q000453:epidemiology / Q000382:microbiology*; D013548:Sweden / Q000453:epidemiology
chemical_list: C025651:CCCGGG-specific type II deoxyribonucleases; D015252:Deoxyribonucleases, Type II Site-Specific