Isolation of Equine rhinitis A virus from a horse semen sample.

This study describes how a virus usually found in horse urine, Equine Rhinitis A, was surprisingly discovered in horse semen, suggesting possible contamination during collection.

Background

• The starting point of this research was a semen sample taken from a perfectly healthy four-year-old American Quarter Horse. The sample was forwarded to the National Veterinary Services Laboratories in order to check for the presence of the Equine arteritis virus.
• Upon visual assessment, it was observed that the semen sample had an unusually yellow color. This prompted the laboratory to further test the sample.

Research Process

• To carry out the test, the semen sample was inoculated onto cell monolayers, a single layer of cells. After five days postinoculation, a cytopathic effect (changes in the cell due to a viral infection) was seen.
• The laboratory then proceeded to test the resultant isolate for the Equine arteritis virus, but the test came out negative.

Discovery and Findings

• Instead of the specific virus they were expecting (Equine arteritis), the laboratory identified the Equine rhinitis A virus in the isolate.
• Previously, Equine rhinitis A virus had been isolated from horse urine, but it had not been described in stallion semen before.
• Thus, the study reveals a new discovery – the isolation of Equine rhinitis A virus from stallion semen, which likely happened due to the contamination of the semen sample with urine during the collection process.