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Seroprevalence of Equine Rhinitis Virus in Louisiana Horses
F. Andrews
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Respiratory disease is common in racehorses and infectious respiratory disease was ranked second, only to colic, among equine practitioners as the most important medical disease concern. The economic impact of viral induced infectious respiratory disease, such as Equine Influenza virus (EIV) and Equine Herpes virus (EHV), on the horse industry is substantial. However, little is known about Equine Rhinitis Virus (ERV) in racehorses at race tracks and training facilities in Louisiana. The purpose of this study was to determine the seroprevalence of ERV in Thoroughbreds and Quarter Horses at a racetrack, training center, and a university farm in Southern Louisiana. Blood samples were collected from horses at a Louisiana racetrack (n = 77), a Louisiana race training facility [n= 44] and at the LSU research and teaching farm (n=55). The samples were frozen and shipped overnight to Cornell Animal Health Diagnostic Center in Ithaca, NY, where serum neutralizing (SN) antibodies to ERAV and ERBV-1 were measured. Serum neutralizing antibodies to ERAV and ERBV were present in 84.1% and 94.9 %, respectively, of horses. Mean SN titers were relatively low for ERBV-1 (57.05 +/- 9.49), whereas SN titers to ERAV were significantly (p< 0.05), higher in horses at the racetrack (392.7 +/- 45.9) and in horses at the university farm (535.8 +/- 91.6), when compared to horses at the training center (42.6 +/- 2.3). ERV (ERAV and ERBV-1) is prevalent in Louisiana horses and SN titers to ERAV were higher in horses housed at the racetrack and university farm, when compared to horses at the training facility. The difference in SN titers may be due to age, as horses at the racetrack and university farm were older allowing more time for virus exposure. ERV is prevalent in horses in Louisiana and warrants further epidemiologic investigation to determine its impact on racing and training
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