Which organism is oxidase positive and does not ferment glucose (glucose neither), showing an alkaline reaction?

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Multiple Choice

Which organism is oxidase positive and does not ferment glucose (glucose neither), showing an alkaline reaction?

Oxidase positive organisms with nonfermentative glucose metabolism fall into a pattern where the test for glucose utilization shows no fermentation (no acid production) and, in some carbohydrate tests, an alkaline shift. Alcaligenes faecalis fits this profile well: it is oxidase positive, does not ferment glucose, and often yields an alkaline reaction in glucose-related tests because it deaminates amino acids to produce ammonia, raising the pH. This combination helps distinguish it from other oxidase-positive nonfermenters. Pseudomonas aeruginosa is also oxidase positive and nonfermentative, but it does not characteristically produce the same alkaline shift in glucose tests. Streptococcus viridans is oxidase negative and ferments glucose, so it doesn’t match this pattern.

Oxidase positive organisms with nonfermentative glucose metabolism fall into a pattern where the test for glucose utilization shows no fermentation (no acid production) and, in some carbohydrate tests, an alkaline shift. Alcaligenes faecalis fits this profile well: it is oxidase positive, does not ferment glucose, and often yields an alkaline reaction in glucose-related tests because it deaminates amino acids to produce ammonia, raising the pH. This combination helps distinguish it from other oxidase-positive nonfermenters. Pseudomonas aeruginosa is also oxidase positive and nonfermentative, but it does not characteristically produce the same alkaline shift in glucose tests. Streptococcus viridans is oxidase negative and ferments glucose, so it doesn’t match this pattern.

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