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

Prepare for the CAMLPR Microbiology Test. Utilize flashcards and engaging multiple-choice questions, each equipped with descriptions and explanations. Ready yourself for an excellent performance!

This question hinges on using a multi-trait biochemical profile to identify an enteric bacterium. The described pattern—non-lactose fermenting, hydrogen sulfide positive, PAD positive, urease positive, and indole positive—maps most closely to Proteus vulgaris. Proteus vulgaris does not ferment lactose, produces hydrogen sulfide on appropriate media, and shows phenylalanine deaminase activity, urease activity, and indole production. It’s useful to contrast with related organisms: Proteus mirabilis, while similar overall, is indole negative, so it wouldn’t fit the indole-positive part. The other species typically do not combine all five traits at once—lactose non-fermenters that lack H2S, or those that are indole negative, or lack urease or PAD activity—so they don’t match the full profile.