Which of the following is considered an oxidase-positive organism?

Neisseria is considered an oxidase-positive organism, which is a key characteristic used in the identification of various bacterial species. Oxidase testing detects cytochrome c oxidase, an enzyme involved in the electron transport chain of certain bacteria. When a bacterium possesses this enzyme, it will produce a color change in the presence of a specific reagent, confirming its oxidase positivity.

Neisseria, specifically species such as Neisseria gonorrhoeae and Neisseria meningitidis, are known for being oxidase-positive. This quality helps differentiate them from other Gram-negative bacteria that do not produce cytochrome c oxidase, making the oxidase test an important tool in microbiology for identifying potentially pathogenic Neisseria species.