Comparison of chlorhexidine and alcohol-based antisepsis of the distal limbs of horses.

The research article focuses on comparing chlorhexidine and alcohol-based antisepsis methods to determine their effectiveness in reducing bacterial count on the distal limb (farther parts such as the paws or feet) of horses.

Objective and Methodology

• The main aim of the study was to verify if ethanol-based antisepsis techniques efficiently reduce bacterial counts on the distal limb of horses, similar to the existing chlorhexidine scrub method. Furthermore, it aimed to discover the most effective application technique for the product.
• The researchers conducted a randomised trial involving 41 horses. Each horse limb was randomly assigned to a treatment group. The treatment groups were chlorhexidine gluconate 4% scrub, 80% ethanol scrub, 80% ethanol spray and 80% ethanol to an unclipped site.
• They collected samples before and after treatment and performed duplicate plating. Bacterial counts were converted to logarithmic form and averaged between duplicates.
• A linear mixed model was used to compare the mean log reduction of bacterial colonies forming units/mL between groups.
• They also undertook a cost-benefit analysis to assess the economic feasibility of each method.

Results

• The results revealed no significant difference in bacterial count reduction between chlorhexidine gluconate and ethanol scrubs on either forelimbs or hindlimbs.
• On forelimbs, no notable difference in bacterial count reduction was observed among all groups. However, on hindlimbs, a significantly greater reduction was seen with chlorhexidine gluconate compared to both the ethanol scrub and spray on unclipped sites.
• The cost-benefit analysis showed no significant difference between the costs associated with chlorhexidine gluconate and ethanol scrub methods, while a significant difference was observed between chlorhexidine and both, the ethanol scrub and spray on unclipped sites.

Long-term Implications

• These findings imply that the reduction in bacterial count on horses’ distal limbs does not differ between the chlorhexidine scrub method and ethanol scrub, and their cost-benefit ratio is similar. Hence, ethanol-based scrubs could be considered as an equally effective and economically viable alternative to the chlorhexidine scrub method, especially in situations where chlorhexidine is not readily available or if the horse is allergic to it.
• Of note, researchers were not blinded to treatment groups during sample collection, which could be a potential source of bias. Future studies should include blinding to further confirm these results.