Which organism is a gram-negative cocci, oxidase positive, that ferments glucose, maltose, and sucrose but not lactose?

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Multiple Choice

Which organism is a gram-negative cocci, oxidase positive, that ferments glucose, maltose, and sucrose but not lactose?

Think about differentiating Neisseria species by their Gram stain, oxidase reaction, and carbohydrate fermentation pattern. All mentioned organisms are gram-negative cocci and oxidase positive, so the clue lies in what sugars they ferment. The described organism ferments glucose, maltose, and sucrose but not lactose. That exact pattern is characteristic of Neisseria sicca. For comparison: Neisseria gonorrhoeae ferments only glucose; Neisseria meningitidis ferments glucose and maltose; Neisseria lactamica ferments glucose, maltose, and lactose. Matching the fermentation profile to these patterns points to Neisseria sicca as the correct organism.

Think about differentiating Neisseria species by their Gram stain, oxidase reaction, and carbohydrate fermentation pattern. All mentioned organisms are gram-negative cocci and oxidase positive, so the clue lies in what sugars they ferment. The described organism ferments glucose, maltose, and sucrose but not lactose. That exact pattern is characteristic of Neisseria sicca. For comparison: Neisseria gonorrhoeae ferments only glucose; Neisseria meningitidis ferments glucose and maltose; Neisseria lactamica ferments glucose, maltose, and lactose. Matching the fermentation profile to these patterns points to Neisseria sicca as the correct organism.

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