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The Journal of veterinary medical science2017; 80(2); 382-386; doi: 10.1292/jvms.17-0538

Neutralization antibody response to booster/priming immunization with new equine influenza vaccine in Japan.

Abstract: Equine influenza (EI) vaccine has been widely used. However, the causative EI virus (H3N8) undergoes continuous antigenic drift, and the vaccine strains must be periodically reviewed and if necessary, updated to maintain vaccine efficacy against circulating viruses. In 2016, the Japanese vaccine was updated by replacing the old viruses with the Florida sub-lineage Clade (Fc) 2 virus, A/equine/Yokohama/aq13/2010 (Y10). We investigated the virus neutralization (VN) antibody response to Fc2 viruses currently circulating in Europe, after booster or primary immunization with the new vaccine. These European viruses have the amino acid substitution A144V or I179V of the hemagglutinin. In horses that had previously received a primary course and bi-annual boosters with the old vaccine booster, immunization with the updated vaccine increased the VN antibody levels against the European Fc2 viruses as well as Y10. There were no significant differences in the VN titers against Y10 and the Fc2 viruses with A144V or I179V substitution in horses that had received a primary course of the updated vaccine. However, a mixed primary course where the first dose was the old vaccine and the second dose was the updated vaccine, reduced VN titers against the European viruses compared to that against Y10. In summary, the new vaccine affords horses protective level of VN titers against the Fc2 viruses carrying A144V or I179V substitution, but our results suggest that the combination of the old and new vaccines for primary immunization would not be optimum.
Publication Date: 2017-12-14 PubMed ID: 29237998PubMed Central: PMC5836781DOI: 10.1292/jvms.17-0538Google Scholar: Lookup
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  • Journal Article

Summary

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The research study explores how vaccinations against equine influenza (horse flu) are updated in Japan to cope with changes in the virus, and how effective this updated vaccination is against current strains of the equine influenza virus found in Europe.

Background

  • Equine influenza is a prevalent illness among horses which is caused by the H3N8 virus. Like many other viruses, H3N8 continuously evolves through a process called antigenic drift, which changes the structure of the virus’s proteins.
  • Because of this continuous change, the vaccines manufactured to protect against equine influenza need to be occasionally updated, just as the human influenza vaccine is.
  • In 2016, Japan updated its equine influenza vaccine by replacing the older strains of the virus used in the vaccine with a newer strain known as A/equine/Yokohama/aq13/2010 (Y10), which is a part of the Florida-clade (Fc) 2 group of H3N8 viruses.

Research Methods

  • The researchers in this study wanted to determine how effective this updated vaccine was against different strains of the Fc2 equine influenza virus currently seen in Europe, some of which have slight changes in their structure (the amino acid substitutions A144V or I179V).
  • They examined the antibody response elicited by the updated vaccine in horses that had previously been vaccinated with the older version of the vaccine, or those that were receiving the vaccine for the first time.

Findings

  • The results indicated that the updated vaccine did prompt an antibody response against the European strains of the Fc2 virus, as well as against the Y10 strain.
  • There were no significant differences in the level of antibody response against Y10 and the European Fc2 viruses, regardless of whether the horse had previously been vaccinated with the old vaccine or was receiving the updated vaccine for the first time.
  • However, using a mix of the old and new vaccines for the primary (first) round of vaccination yielded less effective results against the European strains of the virus compared to Y10.

Conclusion

  • The study concluded that the updated vaccine was effective in eliciting an immune response to both the Y10 and European strains of the Fc2 equine influenza virus.
  • However, the results also suggested that combining the old and updated vaccines for initial immunization may not be as effective in protecting against Fc2 virus strains carrying the A144V or I179V substitutions.

Cite This Article

APA
Yamanaka T, Nemoto M, Bannai H, Tsujimura K, Matsumura T, Kokado H, Gildea S, Cullinane A. (2017). Neutralization antibody response to booster/priming immunization with new equine influenza vaccine in Japan. J Vet Med Sci, 80(2), 382-386. https://doi.org/10.1292/jvms.17-0538

Publication

ISSN: 1347-7439
NlmUniqueID: 9105360
Country: Japan
Language: English
Volume: 80
Issue: 2
Pages: 382-386

Researcher Affiliations

Yamanaka, Takashi
  • Equine Research Institute, the Japan Racing Association, 1400-4 Shiba, Shimotsuke, Tochigi 329-0412, Japan.
Nemoto, Manabu
  • Equine Research Institute, the Japan Racing Association, 1400-4 Shiba, Shimotsuke, Tochigi 329-0412, Japan.
Bannai, Hiroshi
  • Equine Research Institute, the Japan Racing Association, 1400-4 Shiba, Shimotsuke, Tochigi 329-0412, Japan.
Tsujimura, Koji
  • Equine Research Institute, the Japan Racing Association, 1400-4 Shiba, Shimotsuke, Tochigi 329-0412, Japan.
Matsumura, Tomio
  • Equine Research Institute, the Japan Racing Association, 1400-4 Shiba, Shimotsuke, Tochigi 329-0412, Japan.
Kokado, Hiroshi
  • Equine Research Institute, the Japan Racing Association, 1400-4 Shiba, Shimotsuke, Tochigi 329-0412, Japan.
Gildea, Sarah
  • Irish Equine Centre, Johnstown, Naas, Co., Kildare, W91 RH93, Ireland.
Cullinane, Ann
  • Irish Equine Centre, Johnstown, Naas, Co., Kildare, W91 RH93, Ireland.

MeSH Terms

  • Animals
  • Antibodies, Viral / blood
  • Antibody Formation
  • Female
  • Horse Diseases / immunology
  • Horse Diseases / prevention & control
  • Horse Diseases / virology
  • Horses
  • Immunization, Secondary / veterinary
  • Influenza A Virus, H3N8 Subtype / classification
  • Influenza A Virus, H3N8 Subtype / immunology
  • Japan
  • Male
  • Neutralization Tests / veterinary
  • Orthomyxoviridae Infections / immunology
  • Orthomyxoviridae Infections / prevention & control
  • Orthomyxoviridae Infections / veterinary
  • Vaccination / veterinary

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Citations

This article has been cited 7 times.
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