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Streptococcus suis Serotype 2 Capsule In Vivo.

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    Nonencapsulated Streptococcus suis strains, often deemed harmless, can regain virulence after mouse passages. This highlights potential risks for swine industry workers exposed to these bacteria.

    Keywords:
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    Area of Science:

    • Veterinary Microbiology
    • Bacterial Pathogenesis
    • Zoonotic Diseases

    Background:

    • Streptococcus suis is a significant swine pathogen causing endocarditis.
    • Many isolates from diseased pigs lack capsules and are considered avirulent.
    • Capsular expression is crucial for S. suis virulence.

    Purpose of the Study:

    • To investigate the potential for nonencapsulated Streptococcus suis to regain virulence.
    • To assess the risk posed by avirulent S. suis strains in the swine industry.

    Main Methods:

    • Passaging a nonencapsulated S. suis strain through mice.
    • Monitoring for capsule re-expression and virulence markers in recovered isolates.

    Main Results:

    • Encapsulated and virulent S. suis strains were recovered after in vivo mouse passages.
    • Nonencapsulated strains demonstrated the capacity to revert to a virulent phenotype.

    Conclusions:

    • Avirulent, nonencapsulated Streptococcus suis strains may pose an underestimated risk.
    • Further research is needed to understand the mechanisms of virulence recovery in S. suis.
    • Enhanced surveillance and control measures are warranted for S. suis in swine populations.