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  • Title: Whole genome sequence analysis of the 2018 Persian onager isolate suggests sublineages within the Taylorella asinigenitalis species.
    Author: Kozak S, Merda D, Duquesne F, Breuil MF, Mawhinney I, Petry S.
    Journal: Vet Microbiol; 2023 Nov; 286():109884. PubMed ID: 37832214.
    Abstract:
    In 2018, a T. asinigenitalis strain (MCE663) was isolated in a Persian onager tested for contagious equine metritis (CEM) in a United Kingdom (UK) zoo. This bacterium had never been reported in the UK and Multilocus Sequence Typing described a new atypically divergent ST (ST60). Although the causative agent of CEM is the bacterium Taylorella equigenitalis, a first natural outbreak of endometritis caused by T. asinigenitalis ST70 was reported in 2019, putting its pathogenic potential into question. In this context, we aimed to further sequence the T. asinigenitalis MCE663 genome and characterize the strain using phenotypical and genetic approaches. Results showed that it gathered all identification characteristics of T. asinigenitalis with smaller colonies and it was susceptible to all tested antibiotics. Genome-level phylogeny showed that the genome MCE663 formed a distinct phylogroup, and only shared ≈ 96.1% of average nucleotide identity (ANI) with the three published T. asinigenitalis genomes, which together shared ≈ 98.3% ANI. According to current cut-offs consensus for species and subspecies delineation (95% and 98%, respectively), our results support the first insights of a sublineage delineation within the T. asinigenitalis species.
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