Comparison of concentrations of Rhodococcus equi and virulent R. equi in air of stables and paddocks on horse breeding farms in a temperate climate.
Authors: Muscatello G, Gerbaud S, Kennedy C, Gilkerson J R, Buckley T, Klay M, Leadon D P, Browning G F
Journal: Equine veterinary journal
Summary
# Editorial Summary: Airborne Rhodococcus equi Risk in Stables vs Paddocks Rhodococcus equi pneumonia remains a significant disease in foal populations, with infection thought to occur primarily through inhalation of virulent organisms from contaminated environmental dust. Muscatello and colleagues collected sequential air samples across the 2003 foaling season from stables and paddocks on three Irish breeding farms with documented R. equi problems, using colony blotting and DNA hybridisation to identify and quantify virulent strains specifically. The findings were striking: stables presented 173 times greater odds of harbouring detectable airborne virulent R. equi compared with paddocks, and median airborne concentrations were significantly higher in stables across all three farms (P < 0.001). For equine professionals managing breeding farms in temperate climates, these results suggest that stable environment modification—particularly enhanced ventilation, selection of less dusty bedding materials, and strategic use of fogging agents—represents a practical and evidence-based approach to reducing R. equi pneumonia incidence and severity in young stock.
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Practical Takeaways
- •Stables pose substantially higher infection risk than paddocks for R. equi pneumonia — prioritize stable management if your farm has had disease cases
- •Focus on improving ventilation, switching to less dust-producing bedding, and consider fogging protocols to reduce airborne virulent organism concentrations
- •Environmental contamination in stables is a modifiable risk factor — these management changes are practical steps to reduce foal pneumonia outbreaks on breeding farms
Key Findings
- •Odds of detecting airborne virulent R. equi in stables were 173 times greater than in paddocks
- •Median airborne concentration of virulent R. equi was significantly higher in stables than paddocks on all farms (P < 0.001)
- •Stables were identified as high-risk areas for R. equi infection on horse breeding farms in temperate climates
- •Improved stable air hygiene through ventilation, bedding material selection, and fogging agents may reduce R. equi pneumonia incidence