In vitro antimicrobial activity against equine Lawsonia intracellularis strains.

Summary

# Editorial Summary Lawsonia intracellularis causes equine proliferative enteropathy, an increasingly recognised condition characterised by diarrhoea, severe protein loss and potential mortality if left unmanaged; effective treatment depends on timely antimicrobial intervention, yet little was known about drug susceptibilities of equine strains. Pereira and colleagues addressed this gap by isolating L. intracellularis from affected horses and conducting in vitro antimicrobial susceptibility testing against commonly used equine therapeutics, working within cell culture systems necessary for this obligate intracellular pathogen. The research identified differential susceptibility patterns across various antimicrobial classes, providing critical data on which drugs demonstrate genuine efficacy against equine strains rather than relying on extrapolations from other species. These findings directly inform clinical decision-making, allowing practitioners to select antimicrobials most likely to resolve infection and improve recovery rates in affected animals. For farriers and other equine professionals working with horses showing signs of protein loss or chronic diarrhoea, this research underpins the veterinary diagnostic and treatment protocols that should be pursued, whilst highlighting the importance of prompt diagnosis and species-specific antimicrobial choices in managing this emerging disease.

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Key Findings

• •Study evaluated antimicrobial susceptibilities of equine Lawsonia intracellularis strains isolated in cell culture
• •L. intracellularis is an obligate intracellular bacterium requiring cell culture maintenance for susceptibility testing
• •Timely antimicrobial treatment is critical for EPE recovery and requires knowledge of strain susceptibilities

Conditions Studied

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