Related Experiment Videos
Equine vaccine for West Nile virus
1Biological Research and Development, Fort Dodge Animal Health, Fort Dodge, Iowa 50501, USA. tng@fdah.com
Developments in Biologicals
|December 18, 2003
Summary
A new killed West Nile virus (WNV) vaccine shows high efficacy in horses, significantly reducing WNV infection. Field studies confirm the vaccine is safe for equine use, including pregnant mares.
Area of Science:
- Veterinary Virology
- Equine Immunology
- Vaccinology
Background:
- West Nile virus (WNV) poses a significant threat to equine health.
- Effective vaccines are crucial for controlling WNV outbreaks in horses.
Purpose of the Study:
- To evaluate the immunogenicity and efficacy of a novel killed WNV vaccine in horses.
- To assess the safety profile of the killed WNV vaccine under field conditions.
Main Methods:
- Dose titration study to assess antibody responses post-vaccination.
- Experimental WNV challenge in vaccinated and control horses.
- Field safety study involving 648 horses, including pregnant mares.
Main Results:
- Significant serum neutralizing antibody increases observed in all dose groups after vaccination.
- Vaccinated horses showed a 94% reduction in WNV viraemia compared to controls post-challenge.
- The vaccine demonstrated a favorable safety profile with minimal adverse reactions in 96% of administrations.
Conclusions:
- The killed WNV vaccine is immunogenic, safe, and efficacious in horses.
- This vaccine represents a valuable tool for WNV prevention in equine populations.
- Further studies could explore long-term immunity and broader WNV strain coverage.