The role of Leptospira spp. in horses affected with recurrent uveitis in the UK.
Authors: Malalana F, Blundell R J, Pinchbeck G L, Mcgowan C M
Journal: Equine veterinary journal
Summary
# Editorial Summary: Leptospira spp. and Equine Recurrent Uveitis in the UK Equine recurrent uveitis (ERU) remains a significant clinical challenge, causing chronic ocular pain and vision loss across the UK horse population, yet the underlying aetiological factors continue to warrant investigation. Malalana and colleagues examined the prevalence and role of Leptospira species infection in horses presenting with ERU across UK populations, using serological testing and intraocular fluid analysis to establish the bacterium's involvement in disease pathogenesis. Contrary to findings in mainland Europe and North America where Leptospira has been identified as a substantial aetiological factor, this UK-based research confirmed that Leptospira spp. are not major contributors to ERU development in British horses, supporting the hypothesis that regional differences in environmental exposure, serovars, or other aetiological pathways may account for geographical variation in disease aetiology. For UK equine practitioners, these findings reinforce that diagnostic and therapeutic approaches to ERU should focus on other established triggers—such as viral infections (particularly equine herpesvirus-1), immune-mediated mechanisms, and trauma—rather than routinely investigating for leptospiral involvement as a primary cause. This geographically-specific evidence base ultimately strengthens clinical decision-making and optimises investigation protocols for affected animals in UK practice.
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Practical Takeaways
- •ERU diagnostic and treatment protocols may differ between UK and continental European practices; clinicians should consider regional epidemiological differences when investigating uveitis cases
- •While Leptospira testing may be routine in European ERU workups, UK evidence suggests alternative aetiologies should be prioritised in the diagnostic approach
- •Regional variation in Leptospira prevalence highlights the importance of local epidemiological data rather than applying international protocols uniformly
Key Findings
- •Leptospira spp. have been commonly implicated in ERU pathophysiology in mainland Europe and the USA
- •Leptospira is reported not to be a major aetiological factor in ERU cases in the UK
- •No recent UK studies have investigated the role of Leptospira in ERU despite the condition being a common cause of ocular pain and blindness in horses