Population dynamics of Campylobacter jejuni in healthy dairy calves reared with and without exposure to wild birds.

INTRODUCTION In order to understand the emergence, persistence and transmission of Campylobacter jejuni in livestock, this longitudinal study characterised the C. jejuni population in young calves and assessed the impact of exposure to wild birds during the pre-weaning period. METHODS AND RESULTS Faecal samples were collected on eight occasions from 48 calves housed in three pens between birth and 10 weeks of age, two of the pens being covered with orchard netting. From the 250 C. jejuni isolates obtained from the positive faeces, seven distinct sequence types (7-gene legacy MLST) were identified, with high genetic similarity of circulating strains. On each pen, sequential dominance of ST was observed, with ST-508 and ST-50 prevalent in calves under 4-week-old, and ST-520 or ST-422 prevalent in the 8 to 10-weeks old calves. Exposure of calves to wild birds did not influence genotypes distribution, α-diversity, and community dissimilarity. However, a difference in C. jejuni populations between the two groups of calves that were not exposed to birds suggests that calving rank may shape the type and succession of ST detected over time. CONCLUSION This study provided no evidence for exposure to wild birds being a driver for C. jejuni population changes in healthy pre-weaned calves.

• Publication year

  2025

• Venue

  Journal of Applied Microbiology

• Publication date

  2025-11-29

• Fields of study

  Medicine, Environmental Science

• Identifiers
  DOI 10.1093/jambio/lxaf294PMID 41317002
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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