A new strain of Taylorella asinigenitalis shows differing pathogenicity in mares and Jenny donkeys.

The research article discusses a new strain of the bacterium Taylorella asinigenitalis that has a differing impact on mares and Jenny donkeys, causing severe infection in the former but showing no sign of infection in the latter.

Research Objective and Method

• The primary objective of the research was to isolate and identify the causative agent behind the purulent (pus-producing) endometritis (inflammation of the uterus lining) observed in horse mares after they were inadvertently inseminated with semen from a Taylorella asinigenitalis-positive Jack donkey.
• The researchers undertook a case report approach to gather empirical observations and data. They took endometrial swabs from the infected mares and cultured them under both aerobic (presence of oxygen) and microaerophilic (low oxygen) conditions in selective and non-selective media. The bacteria grown from these cultures were then put through several tests to identify them.

Testing and Identification

• The researchers used Gram staining, a common technique employed in microbiology to identify and classify bacteria.
• Oxidase and catalase tests were performed, which are biochemical tests used to identify enzymes that bacteria produce.
• The Monotayl Latex Agglutination test was used to identify certain types of bacteria in samples.
• PCR, or polymerase chain reaction, tests specific for Taylorella equigenitalis and Taylorella asinigenitalis, the two species of the Taylorella genus, were employed to identify the species of Taylorella present.

Result Analysis

• The bacterial isolate was subjected to antimicrobial susceptibility testing to ascertain the effectiveness of different antibiotics against it.
• Additionally, the bacterium was genotyped, a process wherein the type of genes in its DNA are identified, using multilocus sequence typing (MLST). This test confirmed the presence of a new sequence type of T. asinigenitalis.

Findings and Conclusion

• The researchers noted the limitations of their study, acknowledging that it was based on a limited number of mares and donkeys.
• They conclude that the new strain of T. asinigenitalis they discovered has the ability to cause severe venereal (sexually transmitted) infections in mares but does not appear to cause an equivalent infection in Jenny donkeys.