Peer-reviewed veterinary case report
New strain of Streptococcus causing mastitis in Arabian foal
By Bustos, Carla Paola et al.·Published in Journal of equine veterinary science·2023·Universidad de Buenos Aires·View original on PubMed →
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Original publication title: Novel Genotype of Streptococcus dysgalactiae subsp. equisimilis Associated with Mastitis in an Arabian Filly: Genomic Approaches and Phenotypic Properties.
- Species:
- horse
Plain-English summary
An 8-day-old Arabian filly was diagnosed with mastitis, an infection of the mammary gland. Researchers identified a specific strain of bacteria called Streptococcus dysgalactiae subsp. equisimilis (Sde) as the cause. This strain had unique genetic features and was found to have some genes that could help it resist antibiotics, although no direct resistance mechanisms were identified. This case is significant as it highlights a new strain of bacteria linked to mastitis in young horses, which could help veterinarians better understand and treat this condition in the future.
People also search for: horse mastitis treatment · Arabian filly infection · Streptococcus dysgalactiae in horses
Abstract
Streptococcus dysgalactiae subsp. equisimilis (Sde) is a commensal bacterium of horses that causes opportunistic infections. The aim of the work was to study genotypic and phenotypic properties of the Sde strain related to equine neonatal mastitis. Sde was isolated from an 8 day-old filly and sequenced for genome analysis, antibiotic susceptibility tests and virulence factor (VF) assays. The Sde strain presented the novel emm-subtype stC839.12 and the novel multilocus-sequence type ST-670, which belonged to a specific equine genotype group. Although no specific genotypic mechanisms related to antibiotic resistance were found, it presented genes encoding efflux pumps and transporters pmrA, bmrC and lmrP. Genes encoding several putative VFs including emm, cpa, fbp-2, adcA, hyl, htrA, tig, slo, and ndk and loci-encoding phosphoenolpyruvate-protein phosphotransferase systems were identified. This is the first report of an equine neonatal mastitis case caused by a novel genotype and horse specific Sde strain.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/37661038/