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Volume 10, Issue 12

Zoonotic transmission of asymptomatic carriage on dairy farms in Canterbury, New Zealand Open Access

Abstract

Zoonotic pathogen transmission is of growing concern globally, with agricultural intensification facilitating interactions between humans, livestock and wild animals. is a major human pathogen, but it also causes mastitis in dairy cattle, leading to an economic burden on the dairy industry. Here, we investigated transmission within and between cattle and humans, including potential zoonotic transmission of isolated from cattle and humans from three dairy farms and an associated primary school in New Zealand. Nasal swabs (=170) were taken from healthy humans. Inguinal and combined nasal/inguinal swabs were taken from healthy cattle (=1163). Whole-genome sequencing was performed for 96 . isolates (44 human and 52 cattle). Multilocus sequence typing and assessments of antimicrobial resistance and virulence were carried out. Potential within- and across-species transmission events were determined based on single nucleotide polymorphisms (SNPs). Thirteen potential transmission clusters were detected, with 12 clusters restricted to within-species and one potential zoonotic transmission cluster (ST5). Potential transmission among cattle was mostly limited to single age groups, likely because different age groups are managed separately on farms. While the prevalence of antimicrobial resistance (AMR) was low among both bovine and human isolates, the discovery of an extended-spectrum beta-lactamase gene ( ) in a bovine isolate was concerning. This study provides evidence around frequency and patterns of potential transmission of on dairy farms and highlights the AMR and virulence profile of asymptomatic carriage isolates.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): AMR , cluster , mastitis , Staphylococcus aureus , transmission and virulence
Funding
This study was supported by the:
  • Health Research Council of New Zealand (Award 16/475)
    • Principal Award Recipient: PippaScott
© 2024 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2025-11-11

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Zoonotic transmission of asymptomatic carriage Staphylococcus aureus on dairy farms in Canterbury, New Zealand
M Gen 10, 001318 (2024); https://doi.org/10.1099/mgen.0.001318
/content/journal/mgen/10.1099/mgen.0.001318
/content/journal/mgen/10.1099/mgen.0.001318
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