Equine Viral Arteritis

Statistics
KY's EVA Regulation

HISTORY

During the spring of 1984 a virus identified by the University of Kentucky's Department of Veterinary Science as Equine Arteritis Virus was threatening Kentucky's thoroughbred population. As a result of the continued spread of the virus amongst Central Kentucky's thoroughbred farms, all breeding of thoroughbred horses was ordered stopped during the early summer months by The Kentucky Department of Agriculture.

The Department of Agriculture, working cooperatively with the University of Kentucky's Department of Veterinary Science, worked throughout the fall and winter to determine the extent of the recent outbreak. Prior to the 1985 breeding season all thoroughbred stallions were tested under the supervision of the Department. All stallions found to be positive to the serology test were quarantined while additional testing was conducted to determine if they in fact were carrier's of the arteritis virus.

After a short delay, non-affected stallions were permitted to begin breeding in 1985. Stallions which were not vaccinated against the virus were monitored by serology testing every 14 days throughout the course of the breeding season to insure that the virus was not being spread.
Stallions which were found to be shedding arteritis virus were permitted to return to breeding midway through the '85 breeding season. These stallions were heavily regulated by the Department of Agriculture to insure that they were bred only to qualified mares which were approved to be bred by the State Veterinarian's Office while following a stringent post breeding protocol consisting of isolation and quarantine.

Today there are no known thoroughbred shedding stallions standing at stud in Kentucky. The Department of Agriculture requires that all thoroughbred stallions standing at stud in Kentucky be vaccinated annually against Equine Arteritis Virus. Stallions which are standing their first season in Kentucky are required to be tested prior to vaccination in order to determine that they are not affected with the arteritis virus. As of today the only commercially approved vaccine for use is manufactured by Fort Dodge Laboratories and is called ARVAC®.

The Kentucky Department of Agriculture, working cooperatively with the Jockey Club maintains a stallion roster to insure that all stallions standing in Kentucky are properly vaccinated.

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