Isolation of equine coital exanthema virus (equine herpesvirus 3) from the nostril of a foal.

The research article is about a study that successfully isolated equine coital exanthema virus, also known as equine herpesvirus 3, from a lesion in a young foal’s nostril, indicating another way the virus can be transmitted among horses without mating.

Study Objective

• The objective of the study was to investigate the possibility of non-sexual transmission of the equine herpesvirus 3, which typically causes genital lesions in horses.

Research Methodology

• The study commenced when a mare developed vesicular lesions on her vulva a week after returning from a stallion station. The sores were clinically diagnosed as coital exanthema.
• Five days later, a lesion appeared on the nostril of the mare’s 2-month-old foal, which prompted further investigations.

Significant Findings

• The researchers successfully isolated the equine herpesvirus 3 from the lesion on the foal’s nostril. This was a significant finding, as the typical means of transmission was previously thought to be exclusively sexual.
• The vesicular lesions ordinarily associated with the virus usually manifest around the oral and nasal cavities of horses, pointing to a possible new method of virus transmission.

Conclusions and Implications

• The successful isolation of the virus confirmed that it is capable of being transmitted from horse to horse without coitus, which shows the importance of laboratory diagnosis in differentiating the cause of vesicular lesions.
• This revelation can significantly influence management and prevention strategies for equine herpesvirus 3, specifically in settings where horses are kept in close quarters, such as stables and breeding centres.