Salmonellae growing on XLD Agar

  • XLD agar is a selective growth medium used in the isolation of Salmonella and Shigella species from clinical samples.
  • Salmonellae metabolise thiosulfate to produce hydrogen sulfide, which leads to the formation of colonies with black centers and allows them to be differentiated from the similarly coloured Shigella colonies.

Salmonella bacteria growing on XLD agar

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