Which organism matches the profile NLF; Oxidase positive; Alk/ALK; Cetrimide positive?

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Multiple Choice

Which organism matches the profile NLF; Oxidase positive; Alk/ALK; Cetrimide positive?

This profile points to Pseudomonas aeruginosa. Being a non-lactose fermenter means it won’t acidify lactose on MacConkey agar, so colonies stay colorless. Oxidase positive distinguishes it from many Enterobacteriaceae that are oxidase negative. An alkaline/alkaline (K/K) result on a sugar fermentation test like TSI indicates no carbohydrate fermentation, which is typical for many Pseudomonas species that catabolize proteins rather than ferment sugars. The ability to grow on cetrimide agar is a classic, selective trait used to isolate Pseudomonas aeruginosa, as it tolerates and even thrives in the presence of cetrimide. Put together, these characteristics align most closely with Pseudomonas aeruginosa.

This profile points to Pseudomonas aeruginosa. Being a non-lactose fermenter means it won’t acidify lactose on MacConkey agar, so colonies stay colorless. Oxidase positive distinguishes it from many Enterobacteriaceae that are oxidase negative. An alkaline/alkaline (K/K) result on a sugar fermentation test like TSI indicates no carbohydrate fermentation, which is typical for many Pseudomonas species that catabolize proteins rather than ferment sugars. The ability to grow on cetrimide agar is a classic, selective trait used to isolate Pseudomonas aeruginosa, as it tolerates and even thrives in the presence of cetrimide. Put together, these characteristics align most closely with Pseudomonas aeruginosa.

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