Review of the role of biofilms in equine wounds: Clinical indications and treatment strategies

Recognition of the role that biofilms play in the persistence of wounds and lack of response to therapy in horses is increasing. Prevention of biofilm development in the early stages of wound care involves three primary strategies: wound debridement and cleansing to reduce bacterial counts in the wound bed, appropriate use of advanced wound dressings and implementation of topical antimicrobial agents. Once formed, eradication of biofilms requires elimination to improve the wound environment for contraction and epithelialisation while not further harming the native cells integral to the healing process, which is achieved predominantly through repeated lavage and debridement combined with topical antimicrobial therapy. Pseudomonas, Enterococcus and Staphylococcus bacterial species have been most commonly identified in equine wounds with delayed healing. This review will establish why and how biofilms form, how to recognise clinical indications that biofilms have formed in equine wounds and review current diagnostic options and biofilm-based wound care strategies to eradicate biofilms. Clinical scenarios for cases in which biofilms developed and were successfully treated will be presented. This review will advance practitioners' understanding of the presence and role of biofilms in equine wounds and provide an updated summary of recommended treatment strategies.