The host model Galleria mellonella is resistant to taylorellae infection.

This research investigates the resistance of the Galleria mellonella larva model to infection from Taylorella bacteria, concluding that the larvae are resilient against it and thus, not a suitable model for studying these bacteria.

Taylorella Species

• The genus Taylorella includes two species: Taylorella equigenitalis, which causes Contagious Equine Metritis (CEM), a sexually transmitted disease in horses; and Taylorella asinigenitalis, a similar species that is generally nonpathogenic. Nevertheless, there have been documented cases of it causing inflammation in mares.

Need for Alternate Host Model

• Prior to this research, little was known regarding the pathogenic nature and host colonization ability of both T. equigenitalis and T. asinigenitalis and there was a clear need for an alternative host model to further investigate these species.

Exploring Galleria mellonella Larvae as an Alternate Host Model

• The researchers chose Galleria mellonella larvae as potential alternate model hosts for the Taylorella species.
• The research found that even when the larvae were infected with high concentrations of Taylorella, no significant larval mortality was observed, and the Taylorella species were unable to proliferate within the larvae.

Conclusion of the Study

• The findings showed that G.mellonella larvae are resistant to Taylorella infection, making them an irrelevant alternative system for studying the virulence of Taylorella species.
• This research is significant because it offers insights into the pathogenicity and host colonization capacity of T. equigenitalis, and T. asinigenitalis and the search for a suitable host model for these bacteria.