Detection and genetic characterization of equine viruses in Sweden using viral metagenomics.
Authors: Blomström Anne-Lie, Källse Annika, Riihimäki Miia
Journal: BMC veterinary research
Summary
# Editorial Summary Viral metagenomics—a technique that sequences all genetic material in a sample without requiring prior knowledge of which pathogens are present—enabled researchers to comprehensively map viral populations in Swedish horses with fever and healthy controls, identifying both established equine pathogens and previously uncharacterised or unexpected viral sequences. By analysing both serum and nasal swab samples, the team could detect viruses at different stages of infection and in tissues with distinct exposure patterns, providing a more complete epidemiological picture than traditional diagnostic methods. The study's findings highlight the substantial burden of undiagnosed viral infections circulating within apparently routine equine populations and offer genetic characterisation data that may facilitate faster, more targeted diagnosis of emerging health problems. For practitioners, these results underscore the value of molecular diagnostics in cases where clinical signs suggest viral involvement but conventional testing returns negative results, and suggest that some acute febrile episodes may involve viral co-infections or novel agents not covered by standard screening panels. Understanding the true diversity and prevalence of equine viruses in our populations is essential for informing vaccination strategies, biosecurity protocols, and differential diagnostic approaches that reflect contemporary disease landscapes rather than historical patterns.
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Practical Takeaways
- •Viral metagenomics is a valuable diagnostic tool for identifying multiple viral pathogens simultaneously in horses with fever when conventional diagnostics are inconclusive
- •Understanding the spectrum of viruses circulating in local populations helps inform disease management and biosecurity protocols on individual properties
- •Consider viral screening in febrile horses where common pathogens have been ruled out, as unknown viruses may be contributing to disease
Key Findings
- •Viral metagenomics successfully identified multiple equine viral pathogens in serum and nasal samples from Swedish horses
- •Fever presentation was associated with specific viral detection patterns compared to control horses
- •Study identified previously undiagnosed or underrecognized viruses circulating in the equine population