Nasal transmission of equine parvovirus hepatitis.
Authors: Tomlinson Joy E, Van de Walle Gerlinde R
Journal: Journal of veterinary internal medicine
Summary
# Equine Parvovirus Hepatitis: Nasal Transmission Equine parvovirus hepatitis (EqPV-H) represents a significant clinical concern given its high prevalence in equine populations and capacity to cause anything from silent infection through to fatal hepatic disease, often manifesting in herd outbreaks. Despite well-established iatrogenic transmission routes, the natural pathways by which this virus spreads between horses remained poorly understood until Tomlinson and Van de Walle's 2022 investigation, which focused specifically on determining whether nasal transmission represents a viable mode of horizontal disease transmission. Through experimental methodology examining viral shedding patterns and transmission dynamics via respiratory secretions, the researchers provided evidence that nasal routes constitute a significant transmission pathway—a finding particularly important given that the virus is shed simultaneously in nasal, oral and faecal secretions across infected animals. For equine practitioners, these findings have direct implications: biosecurity protocols should emphasise respiratory isolation of affected or suspected cases, direct contact restrictions (including shared equipment and handlers' hands between horses), and heightened vigilance during apparent outbreak situations where multiple animals show clinical signs. Understanding that EqPV-H can spread via nasal secretions reinforces the need to treat this virus with the same transmission precautions typically reserved for respiratory pathogens, particularly in training facilities, sales yards and veterinary hospitals where horse density increases transmission risk.
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Practical Takeaways
- •Implement biosecurity measures targeting multiple transmission routes (respiratory droplets, oral contact, and fecal contamination) given the virus is shed in nasal, oral, and fecal secretions
- •Monitor for both overt and subclinical disease signs in horses, as EqPV-H can present with variable severity and occur in outbreak situations
- •Ensure strict hygiene protocols around equipment and procedures to minimize iatrogenic transmission risk, which is the best-documented transmission route
Key Findings
- •EqPV-H is highly prevalent in equine populations and ranges in severity from subclinical to fatal disease
- •The virus is shed in nasal, oral, and fecal secretions suggesting multiple potential transmission routes
- •Iatrogenic transmission is well-documented while horizontal transmission mechanisms remain incompletely understood
- •Peroral transmission has been reported in at least one horse, indicating fecal-oral route is possible