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Onderstepoort Journal of Veterinary Research

On-line version ISSN 2219-0635
Print version ISSN 0030-2465

Onderstepoort j. vet. res. vol.75 n.2 Pretoria  2008




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



P.G. Howell; Jane P. Nurton; Daleen Nel; Carina W. Lourens; A.J. Guthrie*

Equine Research Centre, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort, 0110 South Africa




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 infections 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.

Keywords: Equine encephalosis virus, horses, neutralizing antibody, orbivirus, prevalence, sero-epidemiology, serotypes



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Accepted for publication 21 April 2008-Editor



Present address: 384 Amberglen, P.O. Box X004, Howick, 3290, South Africa
* Author to whom correspondence is to be directed. E-mail:

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