Quantitative assessment of the risks of reducing the routine swabbing requirements for the detection of Taylorella equigenitalis.
Authors: Wood J L N, Kelly L, Cardwell J M, Park A W
Journal: The Veterinary record
Summary
# Editorial Summary: Taylorella equigenitalis Detection – Reconsidering Swabbing Protocols Contagious equine metritis (CEM) control in British, Irish and European stud farms relies on the Horserace Betting Levy Board's Code of Practice, which has historically mandated microaerophilic culture of endometrial or cervical swabs. Wood and colleagues undertook a quantitative risk assessment to evaluate whether removing routine cervical swabbing recommendations—particularly for low-risk mares—would meaningfully compromise disease detection. Their literature review revealed critical differences in bacterial shedding patterns: chronically infected mares shed *Taylorella equigenitalis* in clitoral swabs in 93% of cases but cervical swabs in only 31%, whereas acutely infected mares showed the opposite pattern (69% clitoral versus 84% cervical detection rates). The modelling suggested that when infection prevalence is low, routine cervical swabbing of low-risk mares offers minimal epidemiological benefit, though the authors emphasise that cervical sampling remains essential when CEM is clinically suspected. This finding supports a risk-stratified approach to screening that could reduce unnecessary laboratory work whilst maintaining vigilance where disease risk is genuine, though practitioners should maintain familiarity with the anatomical distribution patterns of the organism to guide appropriate sampling protocols in individual cases.
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Practical Takeaways
- •Clitoral swabs are more reliable for detecting chronic T. equigenitalis infections in mares; cervical swabs are better for acute infection detection
- •Routine cervical swab culture can be reduced for low-risk mares in low-prevalence populations, but must be retained whenever CEM is suspected clinically
- •Diagnostic strategy should account for infection stage and disease prevalence in the population being screened
Key Findings
- •In chronically infected mares, T. equigenitalis was detectable in clitoral swabs (93%) but only cervical swabs (31%)
- •In acutely infected mares, T. equigenitalis was detectable in cervical swabs (84%) but clitoral swabs (69%)
- •Removing cervical swab culture recommendations showed few benefits when infection prevalence is low
- •Cervical swabs remain vital for diagnosis when CEM is clinically suspected