Which organism is non-lactose fermenting, hydrogen sulfide positive, PAD positive, urease positive, and indole positive?

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Multiple Choice

Which organism is non-lactose fermenting, hydrogen sulfide positive, PAD positive, urease positive, and indole positive?

Biochemical profiling of enteric bacteria uses patterns of metabolic traits to tell species apart. This question asks for a profile that includes non-lactose fermentation, hydrogen sulfide production, PAD positivity, urease positivity, and indole positivity. Proteus vulgaris fits all of these: it does not ferment lactose, it produces hydrogen sulfide, it is positive for phenylalanine deaminase, and it has urease activity; its indole test is positive, which helps distinguish it from Proteus mirabilis (indole negative). The other organisms don’t match this exact combination of five traits, so they don’t fit as well.

Biochemical profiling of enteric bacteria uses patterns of metabolic traits to tell species apart. This question asks for a profile that includes non-lactose fermentation, hydrogen sulfide production, PAD positivity, urease positivity, and indole positivity. Proteus vulgaris fits all of these: it does not ferment lactose, it produces hydrogen sulfide, it is positive for phenylalanine deaminase, and it has urease activity; its indole test is positive, which helps distinguish it from Proteus mirabilis (indole negative). The other organisms don’t match this exact combination of five traits, so they don’t fit as well.

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