Equine Influenza Virus and Vaccines.
Abstract: Equine influenza virus (EIV) is a constantly evolving viral pathogen that is responsible for yearly outbreaks of respiratory disease in horses termed equine influenza (EI). There is currently no evidence of circulation of the original H7N7 strain of EIV worldwide; however, the EIV H3N8 strain, which was first isolated in the early 1960s, remains a major threat to most of the world's horse populations. It can also infect dogs. The ability of EIV to constantly accumulate mutations in its antibody-binding sites enables it to evade host protective immunity, making it a successful viral pathogen. Clinical and virological protection against EIV is achieved by stimulation of strong cellular and humoral immunity in vaccinated horses. However, despite EI vaccine updates over the years, EIV remains relevant, because the protective effects of vaccines decay and permit subclinical infections that facilitate transmission into susceptible populations. In this review, we describe how the evolution of EIV drives repeated EI outbreaks even in horse populations with supposedly high vaccination coverage. Next, we discuss the approaches employed to develop efficacious EI vaccines for commercial use and the existing system for recommendations on updating vaccines based on available clinical and virological data to improve protective immunity in vaccinated horse populations. Understanding how EIV biology can be better harnessed to improve EI vaccines is central to controlling EI.
Publication Date: 2021-08-20 PubMed ID: 34452521PubMed Central: PMC8402878DOI: 10.3390/v13081657Google Scholar: Lookup
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- Journal Article
- Research Support
- U.S. Gov't
- Non-P.H.S.
- Review
Summary
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The research article discusses the constantly evolving Equine Influenza Virus (EIV) which causes annual outbreaks of respiratory disease in horses and its relation to vaccination. It sheds light on how the persistent evolution of EIV provokes recurring disease outbreaks, even amid highly vaccinated horse populations and the attempts to develop effective vaccines.
Evolution of Equine Influenza Virus (EIV)
- The study majorly focuses on the H3N8 strain of EIV, which has been posing a significant threat to the worldwide horse population since its first isolation in the 1960s.
- The H3N8 strain has shown successful evasion of host protective immunity because of its ability to continually gather mutations in its antibody-binding sites.
- This specifies why EIV not only affects horses but is also capable of infecting dogs.
Need for Vaccine and its Challenges
- A thorough clinical and virological protection against EIV can be established by a strong cellular and humoral immune response in vaccinated horses.
- Despite various updates over the years, the effectiveness of equine influenza (EI) vaccines has been a matter of concern. This is because vaccine protective effects degenerate and allow subclinical infections that facilitate transmission into susceptible groups.
Vaccine Development and Improvements
- The study discusses the various strategies used to create efficacious EI vaccines for commercial use.
- It also emphasizes updating vaccines based on available clinical and virological data to enhance protective immunity in vaccinated horse groups.
- Understanding EIV biology in detail is vital to improve EI vaccines and bring the outbreaks under control. This highlights the significance of the research in controlling EI.
Cite This Article
APA
Oladunni FS, Oseni SO, Martinez-Sobrido L, Chambers TM.
(2021).
Equine Influenza Virus and Vaccines.
Viruses, 13(8), 1657.
https://doi.org/10.3390/v13081657 Publication
Researcher Affiliations
- Texas Biomedical Research Institute, San Antonio, TX 78245, USA.
- Department of Veterinary Microbiology, University of Ilorin, Ilorin P.M.B. 1515, Nigeria.
- Department of Biological Sciences, Florida Atlantic University, Davie, FL 33431, USA.
- Texas Biomedical Research Institute, San Antonio, TX 78245, USA.
- Department of Veterinary Science, Gluck Equine Research Center, University of Kentucky, Lexington, KY 40546, USA.
MeSH Terms
- Animals
- Antibodies, Viral / immunology
- Horse Diseases / immunology
- Horse Diseases / prevention & control
- Horse Diseases / virology
- Horses
- Influenza A Virus, H3N8 Subtype / genetics
- Influenza A Virus, H3N8 Subtype / immunology
- Influenza A Virus, H3N8 Subtype / physiology
- Influenza A Virus, H7N7 Subtype / genetics
- Influenza A Virus, H7N7 Subtype / immunology
- Influenza A Virus, H7N7 Subtype / physiology
- Influenza Vaccines / administration & dosage
- Influenza Vaccines / immunology
- Orthomyxoviridae Infections / immunology
- Orthomyxoviridae Infections / prevention & control
- Orthomyxoviridae Infections / veterinary
- Orthomyxoviridae Infections / virology
Grant Funding
- R01 AI145332 / NIAID NIH HHS
Conflict of Interest Statement
The authors declare no conflict of interest.
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