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Onderstepoort Journal of Veterinary Research

versión On-line ISSN 2219-0635
versión impresa ISSN 0030-2465

Resumen

GREWAR, John D.; THOMPSON, Peter N.; LOURENS, Carina W.  y  GUTHRIE, Alan J.. Equine encephalosis in Thoroughbred foals on a South African stud farm. Onderstepoort j. vet. res. [online]. 2015, vol.82, n.1, pp.01-04. ISSN 2219-0635.  http://dx.doi.org/10.4102/ojvr.v82i1.966.

Thoroughbred foal body temperature data were collected from shortly after birth until shortly after weaning during the 2007/2008 season on a stud farm in the Western Cape Province of South Africa. Equine encephalosis (EE) caused by EE virus (EEV) serotype 4 (EEV-4) occurred in the foal group during the first autumn after their birth (March and April 2008). A descriptive study was undertaken to provide data on the EEV maternal antibody status, the association between pyrexia and EEV infection, and the incidence of infection amongst the foals prior to and during the episode. This included the frequent capturing of foal body temperature data and regular collection of serum and whole blood during pyretic episodes. Infection by EEV was determined using both virological and serological methods. A high EE incidence of at least 94% occurred amongst the foal cohort, despite the fact that 37% of foals had previously shown maternal antibody to EEV-4. Pyrexia in foals was not directly associated with EE infection and 41% of infected foals showed no detectable pyretic episode. Information obtained from this EE episode showed the high incidence of EEV infection in foals during the first autumn after their birth. Monitoring foal body temperature can alert farmers to outbreaks of infectious disease, such as EE. These results are relevant to the epidemiology of EE and facilitate greater understanding of it as a differential diagnosis of African horse sickness (AHS), given that EE and AHS have similar epidemiologic profiles.

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