Authors: Quiñones-Pérez Carlota, Martínez Amparo, Crespo Francisco, Vega-Pla José Luis
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary: Seminal Microbiome Changes Associated with Contagious Equine Metritis Carrier Status Contagious equine metritis (CEM) continues to pose a biosecurity challenge on stud farms, with Taylorella equigenitalis carriers being detected on properties previously considered disease-free—a phenomenon potentially explained by interactions between the pathogen and the broader seminal bacterial community. Using 16S rRNA gene sequencing (Ion Torrent platform), researchers compared the bacterial composition of semen from a single stallion sampled during both CEM-positive and CEM-negative states, identifying families representing >5% relative abundance. The carrier sample showed markedly elevated Corynebacteriaceae (37.75%) and Peptoniphilaceae (28.56%), whilst the disease-free sample was dominated by Porphyromonadaceae (20.51%), Bacteroidaceae (19.25%) and Peptoniphilaceae (18.57%)—suggesting that Taylorella presence substantially reshapes the seminal microecology. These microbiome shifts may explain why apparently treated stallions can spontaneously revert to carrier status, though the single-case design limits definitive conclusions about mechanisms or prevalence. Given the implications for breeding programmes and disease transmission, larger longitudinal studies tracking microbiome dynamics through treatment and recovery phases would be valuable for developing intervention strategies targeting the seminal bacterial ecosystem rather than relying on pathogen detection alone.
Read the full abstract on PubMed
Practical Takeaways
- •Stallion carrier status for contagious equine metritis may fluctuate due to interactions between Taylorella and seminal microflora, complicating disease management on apparently agent-free farms
- •Microbiome analysis could potentially be developed as a diagnostic tool to detect Taylorella carriers, though current evidence is limited to a single case
- •More research with larger sample sizes is needed before microbiome composition can be used clinically to predict or monitor carrier status
Key Findings
- •Seminal microbiome composition differs significantly between Taylorella-positive and Taylorella-negative carrier states in the same stallion
- •Taylorella-positive sample showed dominant Corynebacteriaceae (37.75%) and Peptoniphilaceae (28.56%) families
- •Taylorella-negative sample was dominated by Porphyromonadaceae (20.51%), Bacteroidaceae (19.25%), and Peptoniphilaceae (18.57%)
- •Largest microbiome differences observed in Corynebacteriaceae, Porphyromonadaceae, and Bacteroidaceae families between carrier states