Which characteristic differentiates Moraxella catarrhalis from other Neisseria species?

Moraxella catarrhalis is characterized by its ability to produce DNase, which sets it apart from other species in the Neisseria genus. This enzymatic property means that Moraxella catarrhalis can break down DNA, leading to a positive result in DNase tests. While many other bacteria may be oxidase positive, non-motile, or also have different fermentation capabilities, these characteristics do not specifically differentiate Moraxella catarrhalis from Neisseria species.

The ability to hydrolyze DNA is not present in Neisseria species, where a negative DNase result is common, making the positive result for Moraxella catarrhalis a distinctive feature. This important biochemical test is useful in the laboratory for identifying Moraxella catarrhalis among other similar bacteria, thereby aiding in the correct diagnosis and treatment of infections caused by this organism.