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Variation in bacterial pathotype is consistent with the sit-and-wait hypothesis.

Eliza Rayner1, Amelie Lavenir1, Gemma G R Murray1,2

  • 1Dept. Veterinary Medicine, Madingley Road, University of Cambridge, Cambridge, CB3 0ES, UK.

Microbiology (Reading, England)
|September 17, 2024
PubMed
Summary
This summary is machine-generated.

Pathogenic bacteria, like Streptococcus suis, may become more virulent by surviving longer outside hosts. This extended environmental survival could enhance zoonotic transmission and virulence evolution.

Keywords:
Pharaoh’s curseStreptococcus suisenvironmental survivalevolution of virulenceindirect transmissionresource allocation hypothesiszoonosis

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Infectious Diseases

Background:

  • The sit-and-wait hypothesis suggests bacteria increase virulence by surviving and transmitting outside hosts, avoiding host-mortality costs.
  • Experimental validation of this hypothesis is limited, despite theoretical support and comparative analyses.

Purpose of the Study:

  • To experimentally test the sit-and-wait hypothesis in *Streptococcus suis*.
  • To investigate the role of environmental survival in the virulence of this zoonotic pathogen.

Main Methods:

  • An *in vitro* environmental survival experiment was conducted.
  • Survival rates of pathogenic and commensal *Streptococcus suis* ecotypes were compared.
  • The effect of polysaccharide capsule presence on survival was assessed.

Main Results:

  • Pathogenic *Streptococcus suis* ecotypes exhibited longer survival times in the environment compared to commensal ecotypes.
  • Survival rates of pathogenic and commensal ecotypes showed similar decline rates.
  • The polysaccharide capsule did not consistently affect bacterial survival.

Conclusions:

  • Extended environmental survival, potentially through the food chain, may enhance the zoonotic capability of *Streptococcus suis*.
  • Controlling long-term environmental bacterial survival could be a strategy to reduce virulence evolution and improve infection control.