A pure culture from an immunosuppressed patient yielded an organism that is nonmotile and positive for indophenol oxidase. What is the likely identification?

The identification of the organism yielding from a pure culture of an immunosuppressed patient as Moraxella lacunata is supported by its nonmotility and positive result for indophenol oxidase. Moraxella lacunata is a species that is commonly associated with opportunistic infections, particularly in immunocompromised individuals. Its characteristic nonmotile nature aligns with the description provided, as many other potential candidates in the options are motile or have different biochemical properties.

Furthermore, the positive indophenol oxidase test indicates that the organism has the ability to oxidize certain compounds, which is a distinguishing feature of Moraxella species, further solidifying its identification. In contrast, the other organisms listed generally do not adhere to these characteristics; they exhibit different motility patterns and oxidase activity. This makes Moraxella lacunata a plausible causative agent in the given clinical context.