The occurrence of equine arteritis virus in Australia.

The research article discusses a study that identifies the presence of the equine arteritis virus (EAV) in Australia for the first time and highlights serological evidence of its existence among Australian horses.

Research Context

• The research revolves around the detection of Equine Arteritis Virus (EAV) in Australia, a viral infection that affects horses and is typically observed in North America.
• This is the first time the presence of EAV has been reported in Australia, representing a significant development in equine healthcare in the region.

Study Findings

• The researchers carried out tests on a group of Standardbred stallions imported from North America, and found that twelve of these horses were carriers of EAV, with the virus identified in their semen.
• In addition, serological tests were administered on 107 stallions to check for serum antibodies against EAV, indicating prior exposure to the virus.
• These tests revealed that 73% of the tested Standardbred stallions were seropositive, meaning they had developed antibodies due to exposure to EAV. Comparatively, only 8% of comparable Thoroughbred stallions tested seropositive.

Further Observations

• Other equine populations were also tested as part of this research project. The researchers found that 71% of Standardbred mares showed presence of serum antibodies to EAV, alongside 6% of Standardbred racehorses, and 1% of Thoroughbred mares and racehorses.
• These figures suggest a significantly higher prevalence of EAV among Standardbred horses, in comparison to Thoroughbreds.

Historical Evidence

• The researchers also examined stored serum samples to gain insight into the historical presence of EAV in Australia. This analysis suggested that the virus has been present in the country since at least 1975.
• This discovery indicates a long-standing, previously undetected presence of EAV in Australia’s equine population, necessitating further research to understand its spread and impact.