Serological study of leptospiral infections and endogenous uveitis among horses and ponies in the United Kingdom.

This research study examines the prevalence of leptospira infections and its potential link to uveal inflammatory disease in horses and ponies in the UK. It suggests that while leptospira infection is not a major cause of equine anterior uveitis, it may be associated with some recurrent cases of the condition.

Research Goals

• This study is aimed at determining the prevalence of antibodies against leptospira antigens in horses and ponies in the UK. The focus is on animals with no ophthalmic abnormalities and those with an ophthalmic condition known as endogenous uveitis.

Methodology

• The researchers employed a microscopic agglutination technique to test for antibodies against a range of 20 leptospira antigens. The test subjects were divided into two groups: animals with no signs of ophthalmic abnormalities and animals with anterior uveitis, an ophthalmoscopic evidence of endogenous uveal inflammatory disease.
• This technique involves adding leptospira to a serum sample and observing under a microscope for signs of agglutination, which would indicate the presence of antibodies against the bacteria.

Outcomes and Findings

• Titres against leptospira antigens were observed in 13 out of 138 animals (9.1%) with no ophthalmic abnormalities, and in three out of 27 (11.1%) animals with anterior uveitis.
• It was also noted that all seropositive animals with anterior uveitis had commonality with a specific strain of leptospira, known as serovar sejroe.
• These results suggest that leptospira infection is not a dominant factor causing equine anterior uveitis in the UK. However, the study indicates that the organism might be associated with some instances of recurring anterior uveitis.

Implications of the Study

• This research contributes to our understanding of the potential connections between leptospira infections and anterior uveitis in horses and ponies. Even though leptospira is not a major cause of this condition, the study emphasizes the need for further research to explore its role in recurrent cases of anterior uveitis.