Serum protein electrophoretic profile changes in West Nile virus-naturally infected horses.
Authors: Chaintoutis S C, Diakakis N, Polizopoulou Z S, Dovas C I
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Serum Protein Changes in West Nile Virus-Infected Horses West Nile virus remains a significant neurological threat to horses, yet clinical diagnosis can be challenging when presentations vary widely from severe encephalitis to inapparent infection. This research characterised serum protein electrophoresis (SPE) patterns across 60 naturally infected horses grouped by clinical status—encephalitic, asymptomatic, and unexposed controls—using automated biuret analysis and cellulose acetate membrane electrophoresis. Encephalitic horses demonstrated markedly elevated total protein, substantially higher α₂-globulin and globulin fractions alongside reduced albumin percentage and albumin-to-globulin ratios, whilst asymptomatically infected horses showed significantly elevated γ-globulin compared to naïve animals. These findings suggest SPE could serve as a useful adjunct diagnostic tool, particularly in differentiating clinical from subclinical infection and supporting early recognition of encephalitis, though practitioners should recognise that protein changes reflect systemic inflammatory response rather than providing aetiological certainty and would need to be interpreted alongside clinical signs and serological testing.
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Practical Takeaways
- •SPE testing can help differentiate West Nile virus-infected horses (symptomatic or asymptomatic) from naive horses, providing a diagnostic aid alongside clinical signs and serology
- •Changes in albumin-to-globulin ratio and specific globulin fractions may help assess severity—horses with encephalitis show more pronounced protein profile alterations than asymptomatic infected horses
- •This diagnostic tool could support early detection and clinical monitoring of West Nile virus in endemic regions, potentially improving management decisions for affected horses
Key Findings
- •Infected horses (both encephalitis and asymptomatic) showed significantly higher total serum protein concentrations compared to naive controls
- •Horses with encephalitis had elevated globulin and α2-globulin levels with lower albumin percentage and albumin-to-globulin ratio than asymptomatic and control horses
- •Asymptomatically infected horses demonstrated significantly higher γ-globulin levels compared to control horses
- •Serum protein electrophoresis profile changes can assist in clinical diagnosis of West Nile virus infection across different infection states