Isolation of the contagious equine metritis organism from colts and fillies in the United Kingdom and Ireland.

The research centers on the isolation of a specific strain of the contagious disease, equine metritis, in young horses in the United Kingdom and Ireland and underscores the need for a thorough examination of the reproductive system of these animals to prevent the disease’s spread.

Research Context

• The research was conducted between January 1978 and August 1982 to study the contagious equine metritis organism (CEMO), a cause of infertility in horses.
• This strain was resistant to streptomycin, a commonly used antibiotic, which makes it extremely problematic for treatment.
• Previous to this study, it seems there was also an outbreak in 1982 commenced by a first-season stallion, highlighting the severity and relevance of the investigation.

Findings and Implications

• Over the duration of the study, the streptomycin-resistant CEMO strain was isolated in fifteen colts and two fillies located in the United Kingdom and Ireland.
• The research delved into the breeding histories of the sires and dams of each infected horse.
• They found that most had contracted the disease either while still in the womb (in utero) or immediately after being born (at parturition).
• Likewise, it was discovered that colt foals could become contaminated with the disease through exposure to the vaginal discharge of mares clinically showing signs of contagious equine metritis during their nursing.
• These findings highlighted the importance of a comprehensive examination of the reproductive system in young male and female horses prior to their breeding careers.
• Such an examination protocol is recommended in the code of practice for controlling CEM.

Significance

• The study brings valuable insights into the transmission and management of CEM, an impactful infectious disease in the equine industry that causes infertility.
• By isolating the streptomycin-resistant CEMO strain and tracing back its possible acquisition routes, the researchers provide a foundation for understanding how the disease spreads, potentially leading to more effective diagnosis, prevention, and control strategies.