Original Research

Prevalence of serotype specific antibody to equine encephalosis virus in Thoroughbred yearlings South Africa (1999-2004)

P. G. Howell, Jane P. Nurton, Daleen Nel, Carina W. Lourens, A. J. Guthrie
Onderstepoort Journal of Veterinary Research | Vol 75, No 2 | a14 | DOI: https://doi.org/10.4102/ojvr.v75i2.14 | © 2008 P. G. Howell, Jane P. Nurton, Daleen Nel, Carina W. Lourens, A. J. Guthrie | This work is licensed under CC Attribution 4.0
Submitted: 31 August 2008 | Published: 31 August 2008

About the author(s)

P. G. Howell, Present address: 384 Amberglen, P.O. Box X004, Howick, 3290, South Africa, South Africa
Jane P. Nurton, Equine Research Centre, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort, 0110 South Africa
Daleen Nel, Equine Research Centre, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort, 0110 South Africa
Carina W. Lourens, Equine Research Centre, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort, 0110 South Africa
A. J. Guthrie, Equine Research Centre, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort, 0110 South Africa

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Abstract

Cohorts of yearlings were sampled over a period of 6 years in a retrospective serological survey to establish the annual prevalence of serotype specific antibody to equine encephalosis virus on Thoroughbred stud farms distributed within defined geographical regions of South Africa. Seasonal seroprevalence varied between 3.6% and 34.7%, revealing both single and multiple serotype infections in an individual yearling. During the course of this study serotypes 1 and 6 were most frequently and extensively identified while the remaining serotypes 2, 3, 4, 5 and 7 were all identified as sporadic and localized in fections affecting only individual horses. This study of the seasonal prevalence of equine encephalosis virus has a corollary and serves as a useful model in the seasonal incidence of the serotypes of African horse sickness and bluetongue in regions where the respective diseases are endemic.

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