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Streptococcus agalactiae infection in zebrafish larvae.

Brandon J Kim1, Bryan M Hancock1, Natasha Del Cid2

  • 1Department of Biology and Center for Microbial Sciences, San Diego State University, 5500 Campanile Drive, San Diego CA 92182, USA.

Microbial Pathogenesis
|January 25, 2015
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Summary

A new zebrafish model reveals Streptococcus agalactiae (Group B Streptococcus) virulence factors. This study identifies key bacterial components and host responses crucial for GBS pathogenesis.

Keywords:
Group B StreptococcusPathogenesisZebrafish larvae

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Aquaculture Pathology

Background:

  • Streptococcus agalactiae (Group B Streptococcus, GBS) causes severe neonatal infections and impacts aquaculture.
  • Zebrafish (Danio rerio) offer a tractable vertebrate model for studying bacterial pathogenesis.

Purpose of the Study:

  • To establish and utilize a larval zebrafish model for investigating GBS pathogenesis.
  • To identify bacterial and host factors contributing to GBS disease progression.

Main Methods:

  • Infection of larval zebrafish with varying doses of GBS.
  • Analysis of GBS mutants lacking key virulence factors (capsule, LTA, toxins).
  • Quantification of host immune responses (cytokines) and bacterial dissemination.

Main Results:

  • GBS infection caused dose-dependent mortality in zebrafish larvae.
  • GBS serotype III, ST-17 strain demonstrated highest virulence.
  • Bacterial capsule, lipoteichoic acid (LTA), and toxin production were essential for GBS virulence.
  • Interleukin-1β (il1b) and CXCL-8 (cxcl8a) were significantly upregulated post-infection.
  • Evidence of GBS translocation into the brain vasculature was observed.

Conclusions:

  • Larval zebrafish serve as a valuable model for studying GBS pathogenesis.
  • Key GBS virulence factors and host immune responses have been elucidated using this model.