Congo red agar, a differential medium for Aeromonas salmonicida, detects the presence of the cell surface protein array involved in virulence.

@article{Ishiguro1985CongoRA,
  title={Congo red agar, a differential medium for Aeromonas salmonicida, detects the presence of the cell surface protein array involved in virulence.},
  author={Edward E. Ishiguro and Thomas Ainsworth and Trevor J. Trust and William W. Kay},
  journal={Journal of bacteriology},
  year={1985},
  volume={164 3},
  pages={1233-7}
}
Strains of the fish pathogen Aeromonas salmonicida which possess the cell surface protein array known as the A-layer (A+) involved in virulence formed deep red colonies on tryptic soy agar containing 30 micrograms of Congo red per ml. These were readily distinguished from colorless or light orange colonies of avirulent mutants lacking A-layer (A-). The utility of Congo red agar for quantifying A+ and A- cells in the routine assessment of culture virulence was demonstrated. Intact A+ cells… CONTINUE READING

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