title: The long-term dynamics of Campylobacter colonizing a free-range broiler breeder flock: an observational study.
abstract: A free-range broiler breeder flock was studied in order to determine the natural patterns of Campylobacter colonization over a period of 63 weeks. Campylobacter sequence types (STs) were not mutually exclusive and on average colonized only 17.7% of the birds tested at any time. Campylobacter STs typically reached a peak in prevalence upon initial detection in the flock before tailing off, although the ST and antigenic flaA short variable region in combination were stable over a number of months. There was evidence that, with a couple of exceptions, the ecology of C. jejuni and C. coli differed, with the latter forming a more stable population. Despite being free range, no newly colonizing STs were detected over a 6-week period in autumn and a 10-week period in winter, towards the end of the study. There was limited evidence that those STs identified among broiler chicken flocks on the same farm site were likely to colonize the breeder flock earlier (R(2) 0.16, P 0.01). These results suggest that there is natural control of Campylobacter dynamics within a flock which could potentially be exploited in designing new intervention strategies, and that the two different species should perhaps be considered separately.
authors.affiliation: The Department of Zoology, University of Oxford, South Parks Road, South Parks Road, Oxford, OX1 3PS, UK.
authors.forename: Frances M
authors.initials: FM
authors.lastname: Colles
authors.forename: Noel D
authors.initials: ND
authors.lastname: McCarthy
authors.forename: Carly M
authors.initials: CM
authors.lastname: Bliss
authors.forename: Ruth
authors.initials: R
authors.lastname: Layton
authors.forename: Martin C J
authors.initials: MC
authors.lastname: Maiden
mesh_terms: D000822:Animal Husbandry / Q000379:methods; D000818:Animals; D002167:Campylobacter / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D002169:Campylobacter Infections / Q000453:epidemiology* / Q000382:microbiology; D002645:Chickens / Q000382:microbiology*; D005516:Food Microbiology; D014644:Genetic Variation; D058885:Multilocus Sequence Typing; D011201:Poultry Diseases / Q000453:epidemiology*