Diseases of the Reproductive Tract of the Stallion
Journal: Fertility and Obstetrics in the Horse
Summary
# Editorial Summary: Diseases of the Reproductive Tract of the Stallion Equine arteritis virus (EAV) establishes chronic-persistent infection in the accessory sex glands of affected stallions, rendering them lifelong reservoirs capable of transmitting the virus through infected semen—a primary concern for breeding programmes and collective herd health. This 2005 study documented an outbreak within an established stallion population following the introduction of seronegative animals, tracking acute infection and viral spread through clinical observation, antigen detection via PCR from nasal swabs and EDTA blood samples, and serological conversion patterns. The research demonstrated that respiratory tract transmission occurs alongside the well-documented venereal route, with infected seminal fluid apparently capable of reaching respiratory mucosae and establishing infection through this alternative pathway. These findings carry significant practical implications: when introducing seronegative stallions to a chronically infected group, respiratory precautions warrant consideration alongside standard reproductive protocols, and acute clinical signs paired with rapid antigen detection should prompt immediate investigation rather than assumption of sole venereal transmission. Understanding EAV's multi-route transmission potential is essential for stud managers and veterinarians designing biosecurity protocols and controlling outbreaks effectively.
Read the full abstract on PubMed
Practical Takeaways
- •Test all stallions for EAV serostatus before introducing them to established groups; respiratory transmission risk is significant even without direct semen contact
- •Chronically infected stallions shed virus persistently in semen and respiratory secretions—biosecurity protocols must address both routes of transmission
- •Use PCR on nasal swabs and blood samples for early detection of acute EAV infection during outbreak investigations, combined with serological follow-up
Key Findings
- •EAV infection in stallions establishes chronic-persistent infection in accessory sex glands, making them viral reservoirs
- •Infected semen is the primary source of virus transmission between animals
- •Horizontal transmission of EAV occurs via respiratory tract when seronegative stallions are introduced to chronically infected groups
- •Acute phase detection is possible via PCR nasal swabs and EDTA blood samples, with seroconversion confirming infection