What is the purpose of using Selenite broth in stool cultures?

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Multiple Choice

What is the purpose of using Selenite broth in stool cultures?

The key idea is enrichment to boost recovery of the target pathogens from stool. Selenite broth contains sodium selenite, which inhibits many of the normal competing enteric bacteria found in stool while allowing Salmonella and Shigella to grow. This selective enrichment increases the chance that those organisms are present in detectable numbers when the sample is later plated on selective/differential media. In practice, the enriched culture is then plated to isolate and confirm the pathogens. Other media listed are solid selective/differential plates used after enrichment, not enrichment broth themselves, so their role isn’t to enhance recovery from mixed flora.

The key idea is enrichment to boost recovery of the target pathogens from stool. Selenite broth contains sodium selenite, which inhibits many of the normal competing enteric bacteria found in stool while allowing Salmonella and Shigella to grow. This selective enrichment increases the chance that those organisms are present in detectable numbers when the sample is later plated on selective/differential media. In practice, the enriched culture is then plated to isolate and confirm the pathogens. Other media listed are solid selective/differential plates used after enrichment, not enrichment broth themselves, so their role isn’t to enhance recovery from mixed flora.

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