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The Veterinary record1995; 136(21); 531-536; doi: 10.1136/vr.136.21.531

Outbreak of equine influenza among horses in Hong Kong during 1992.

Abstract: Equine-2 influenza virus A (H3N8) infection occurred among vaccinated thoroughbred horses in Hong Kong during November and December 1992. The outbreak was unique in that it occurred among a large population stabled under intensive conditions. It resulted in the postponement of seven race meetings over a period of 32 days. The outbreak originated after the importation of horses 25 to 32 days before any clinical signs were reported. Vaccination did not prevent 75 per cent of the population from becoming infected, and half the infected horses developed clinical signs. Vaccination did, however, contribute to reducing the morbidity and the severity and duration of the clinical signs.
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Publication Date: 1995-05-27 PubMed ID: 7660556DOI: 10.1136/vr.136.21.531Google Scholar: Lookup
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  • Journal Article
  • Research Support
  • Non-U.S. Gov't

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research article discusses an outbreak of the Equine-2 influenza virus A (H3N8) among vaccinated thoroughbred horses in Hong Kong in 1992, which impacted a large stable population and disrupted racing events. Despite vaccination efforts, the virus infected most of the population, demonstrating the need for improved protective measures.

Research Context

  • This study focuses on an outbreak of Equine-2 influenza virus A (H3N8) that occurred in November and December 1992, predominantly affecting thoroughbred horses in Hong Kong.
  • The uniqueness of this outbreak was the context it occurred in: a large population of horses stabled under intensive conditions. This situation created a high-risk environment for the rapid spread of the disease.
  • As a consequence, the outbreak led to severe disruptions, including the postponement of seven race meetings over a course of 32 days.

Outbreak Origins and Impact

  • The research found out that the origin of the outbreak was linked to the importation of horses 25 to 32 days before any clinical signs of the infection were reported.
  • Despite all the horses being vaccinated, the vaccine did not effectively prevent the horses from getting infected. The infection rate was a high 75% within the stable population, which indicates failed containment and protection measures.
  • Fifty percent of the infected horses exhibited clinical signs of the disease, in spite of being vaccinated.

Role of Vaccination

  • However, the vaccination did contribute to reducing the morbidity rate and the severity and duration of the clinical symptoms. Therefore, while the vaccine did not prevent infection, it did mitigate the impact of the disease on the horses.
  • This general outcome suggests that despite the initial failure, vaccination still plays a significant role in the management and reduction of disease outbreaks among horses and potentially other livestock.
  • Further research and improvements in vaccination protocols and biosecurity measures are thus necessary to better protect stable populations from influenza outbreaks.

Cite This Article

APA
Powell DG, Watkins KL, Li PH, Shortridge KF. (1995). Outbreak of equine influenza among horses in Hong Kong during 1992. Vet Rec, 136(21), 531-536. https://doi.org/10.1136/vr.136.21.531

Publication

The Veterinary record
ISSN: 0042-4900
NlmUniqueID: 0031164
Country: England
Language: English
Volume: 136
Issue: 21
Pages: 531-536

Researcher Affiliations

Powell, D G
  • Gluck Equine Research Center, Department of Veterinary Science, University of Kentucky, Lexington 40546-0099, USA.
Watkins, K L
    Li, P H
      Shortridge, K F

        MeSH Terms

        • Animals
        • Antibodies, Viral / analysis
        • Commerce
        • Disease Outbreaks / veterinary
        • Female
        • Hong Kong / epidemiology
        • Horse Diseases / epidemiology
        • Horse Diseases / prevention & control
        • Horse Diseases / virology
        • Horses
        • Influenza A virus / immunology
        • Influenza A virus / isolation & purification
        • Influenza Vaccines / administration & dosage
        • Male
        • Nasopharynx / virology
        • Orthomyxoviridae Infections / epidemiology
        • Orthomyxoviridae Infections / prevention & control
        • Orthomyxoviridae Infections / veterinary
        • Orthomyxoviridae Infections / virology
        • Vaccination / veterinary

        Citations

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