Development and Application of a Multiplex Real-Time Polymerase Chain Reaction Assay for the Simultaneous Detection of Bacterial Aetiologic Agents Associated With Equine Venereal Diseases.
Authors: Kim Sung-Hee, Lee Jong-Soo, Lee Ji-Hye, Kim Yong-Joo, Choi Jun-Gu, Lee Soo-Koung, Kim Hyun-Jeong, Yang Sun-Joo, Park Taemok, Lee Sang Kyu, Kang Hae-Eun, Jeoung Hye-Young, Park Jee-Yong
Journal: Journal of equine veterinary science
Summary
# Editorial Summary Bacterial venereal diseases remain a significant threat to equine breeding programmes, causing measurable reductions in conception rates and substantial economic losses. Researchers in South Korea developed and validated a multiplex real-time PCR assay capable of simultaneously identifying and differentiating five major bacterial pathogens—*Taylorella equigenitalis*, *Taylorella asinigenitalis*, *Pseudomonas aeruginosa*, *Klebsiella pneumoniae*, and *Streptococcus zooepidemicus*—from a single sample, with both high sensitivity and specificity. When applied to surveillance samples from 2015, the assay detected *T. equigenitalis* in 21% of samples and *K. pneumoniae* in 2%, whilst revealing no positive results for the other three pathogens. This diagnostic approach enables practitioners and stud managers to move beyond targeted screening for single agents; the ability to detect multiple venereal pathogens simultaneously from routine swabs provides more comprehensive surveillance data and allows earlier identification of infection status in breeding animals. For farriers, veterinarians, and stud advisors managing breeding programmes, adopting this multiplex testing protocol could significantly strengthen biosecurity protocols and reduce the need for repeated sampling, ultimately improving herd health outcomes and breeding efficiency.
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Practical Takeaways
- •Accurate multiplex PCR testing can now identify multiple venereal disease pathogens simultaneously, enabling faster diagnosis and targeted management of breeding horses
- •In this South Korean population, T. equigenitalis remains the most common bacterial venereal pathogen detected; screening protocols should prioritize this organism
- •Implementation of expanded surveillance using this assay allows veterinarians to detect a broader range of venereal pathogens and implement appropriate biosecurity and breeding management decisions
Key Findings
- •A multiplex real-time PCR assay was successfully developed to simultaneously detect and differentiate five bacterial pathogens associated with equine venereal diseases
- •T. equigenitalis was detected in 21.0% (21/100) of surveilled samples and K. pneumoniae in 2.0% (2/100) of samples from horses in South Korea in 2015
- •No samples tested positive for T. asinigenitalis, P. aeruginosa, or S. zooepidemicus in the surveillance population
- •The assay demonstrated high sensitivity and specificity, allowing enhanced surveillance for multiple venereal disease agents in breeding horses