Salmonella Shigella

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Last updated 11:53 PM on 2/25/26
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6 Terms

1
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Color

Pink

2
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Selective Agents

Bile salt - 8.5 g/L

3
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Select For

Gram-negative

  • Salmonella

  • Shigella

4
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Metabolite

Lactose

Sodium Thiosulfate (bacteria would consume and produce H2S)

5
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pH Indicator

Neutral red

Fe++ compound (detects H2S)

6
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Color of Significance

Fermentation byproducts (acidic) = Hot pink

Protein (aa) Metabolism (basic) = Colorless

H2S = black precipitate = MIGHT be salmonella