Experimental infection of horses with African horse sickness virus results in overt disseminated intravascular coagulation.
Authors: Schliewert Eva Christina, Hooijberg Emma H, Goddard Amelia
Journal: Equine veterinary journal
Summary
# Editorial Summary: African Horse Sickness and Disseminated Intravascular Coagulation African horse sickness virus causes devastating disease in non-endemic populations, and whilst the clinical signs of bleeding tendency—petechiae and prolonged haemorrhage from venepuncture sites—are well recognised, the underlying coagulation mechanism has remained poorly characterised. Schliewert and colleagues experimentally infected horses with AHSV to investigate whether the observed bleeding phenotype reflects true disseminated intravascular coagulation (DIC) resulting from tissue factor-mediated vascular endothelial damage. Their findings confirmed overt DIC development during infection, demonstrating that pathological activation of the coagulation cascade is indeed central to AHS pathogenesis rather than merely secondary to other disease processes. For practitioners managing horses in at-risk regions or responding to potential disease outbreaks, this mechanistic clarification has significant implications: recognition of DIC as a primary feature enables more targeted diagnostic approaches (measuring fibrinogen, D-dimer, and platelet counts) and raises the possibility of adjunctive anticoagulant or antifibriolytic therapies, though supportive care remains paramount given the virus's high mortality rate in naive populations. This work provides a rational foundation for exploring whether therapeutic interventions targeting the coagulation cascade might improve survival outcomes in experimentally or naturally infected animals.
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Practical Takeaways
- •AHSV infection causes severe coagulation abnormalities that manifest as visible bleeding signs (petechiae) and prolonged bleeding after routine procedures—critical for early recognition in at-risk populations
- •Vascular endothelial damage appears to be the primary mechanism driving DIC in AHS, suggesting supportive care should focus on vascular protection and hemostasis management
- •Naive equine populations in endemic regions are at high mortality risk; clinical vigilance for bleeding signs should prompt immediate investigation for AHSV in sub-Saharan Africa
Key Findings
- •Experimental AHSV infection in horses produces overt disseminated intravascular coagulation
- •Clinical signs include submucosal petechiae and prolonged bleeding post venepuncture indicating hypocoagulation
- •Pathological activation of haemostasis may result from tissue factor expression due to vascular endothelial damage or dysfunction