Biofilm and Equine Limb Wounds.
Authors: Jørgensen Elin, Bjarnsholt Thomas, Jacobsen Stine
Journal: Animals : an open access journal from MDPI
Summary
Chronic limb wounds in horses frequently fail to heal despite appropriate care, with emerging evidence suggesting bacterial biofilms—protective communities of microorganisms embedded in extracellular matrix—may be a significant contributing factor. Jørgensen, Bjarnsholt and Jacobsen reviewed the current literature on biofilm formation in equine wounds, drawing parallels with well-established biofilm-associated pathology in human chronic wounds, where these structures perpetuate inflammation, impair oxygen delivery, and shield bacteria from both topical antimicrobials and the host immune response. Whilst biofilms have been confirmed in equine traumatic wounds and experimental models demonstrate their capacity to substantially delay healing in equine limbs, routine diagnostic techniques cannot reliably detect them in clinical practice. The authors recommend that biofilm infection should be suspected in any equine limb wound showing unexpectedly slow healing progression, with management focused on aggressive repeated debridement combined with sustained topical antimicrobial application—a departure from single-treatment approaches that prove ineffective against established biofilm communities. This shift in clinical thinking is particularly relevant for farriers and veterinarians managing performance horses, where persistent limb wounds represent both welfare concerns and economically significant complications.
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Practical Takeaways
- •Suspect biofilm infection in equine limb wounds that are not healing as expected, even without culture confirmation, as biofilms are difficult to detect with routine diagnostics
- •Implement repeated debridement combined with topical antimicrobial therapy as the evidence-based treatment approach for suspected biofilm-infected limb wounds
- •Recognize that limb wounds carry inherently higher chronicity risk than body wounds in horses and warrant more aggressive early intervention to prevent biofilm establishment
Key Findings
- •Biofilm formation in equine limb wounds contributes to chronic inflammation and delayed healing, similar to the pattern observed in human chronic wounds
- •Limb wounds in horses are more prone to delayed healing than body wounds, potentially due to biofilm-mediated chronic inflammation and hypoxia
- •Biofilms have been detected in equine traumatic wounds, and experimental models demonstrate that biofilms protract healing in equine limb wounds
- •Advanced diagnostic techniques are required to detect biofilms in wounds, as detection is not yet available through routine diagnostic methods