Importance of VicRK in Streptococcus equi Virulence
Author Information
Author(s): Liu Mengyao, McClure Michael J, Zhu Hui, Xie Gang, Lei Benfang
Primary Institution: Montana State University
Hypothesis
The study evaluates the importance of the two-component regulatory system VicRK to virulence of Streptococcus equi subspecies equi and the potential of a vicK mutant as a live vaccine candidate.
Conclusion
The deletion of the vicK gene significantly attenuates the virulence of Streptococcus equi in mouse models and suggests that the ΔvicK mutant could be developed as a live vaccine.
Supporting Evidence
- The ΔvicK mutant is attenuated in virulence in both subcutaneous and intranasal infections in mice.
- Infection with the ΔvicK mutant protects mice against reinfection with wild-type S. equi.
- Intranasal ΔvicK infection induces production of anti-SeM mucosal IgA and systemic IgG.
Takeaway
Scientists found that a modified version of a bacteria that causes strangles in horses is less harmful and could help protect against future infections.
Methodology
The study used mouse infection models to evaluate the virulence of a ΔvicK mutant of Streptococcus equi.
Limitations
The study was conducted in mouse models, which may not fully represent the infection dynamics in horses.
Participant Demographics
Outbred CD-1 Swiss mice were used in the experiments.
Statistical Information
P-Value
0.0066
Statistical Significance
p<0.01
Digital Object Identifier (DOI)
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