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Updated: Jan 20, 2026
The Use of Traditional Fear Tests to Evaluate Different Emotional Circuits in Cattle
Published on: April 22, 2020
Diverse strains of Actinobacillus lignieresii isolated from clinically affected cattle in a geographically restricted
1Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, Queensland, Australia.
Objective:
To investigate whether an outbreak of Actinobacillus lignieresii was caused by one or multiple strains.
Methods:
Nine isolates of A. lignieresii were obtained from the lymph nodes of 15 affected cattle from two farms to determine whether a single strain was involved. An enterobacterial repetitive insertion consensus sequence (ERIC) PCR was used for genotyping, and the repeats-in-toxin genes were analysed by PCR and sequencing.
Results:
Isolates from the two farms belonged to two and three genotypes, with a total of four genotypes detected. Genes of the apxICABD operons of some strains had deletions in the apxIA (~697 bp) and in the apxID (~187 bp) genes. The toxin gene deletions and the ERIC PCR patterns suggested the involvement of different A. lignieresii genotypes.
Conclusion:
There was no evidence that a unique genotype was associated with actinobacillosis on the two farms, confirming that this disease was associated with other contributing factors.
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