A yellow-pigmented gram-negative rod is isolated from the tracheal aspirate of a 76-year-old female. She is comatose due to meningitis and on a ventilator. The organism proved to be:
$\begin{array}{ll}
\text {MacConkey agar: clear colonies}& \text {Oxidase: no color change}\

\text {Motility: positive}& \text {TSI: $ \mathrm{K} / \mathrm{NC} $}\end{array}$

OF medium:
Open tubes: glucose: yellow, lactose: yellow, maltose: yellow
Closed tubes: glucose: green, lactose: green, maltose: green
When assessing the organisms's clinical significance, it is probably

Question

A yellow-pigmented gram-negative rod is isolated from the tracheal aspirate of a 76-year-old female. She is comatose due to meningitis and on a ventilator. The organism proved to be:
$\begin{array}{ll}
 \text {MacConkey agar: clear colonies}& \text {Oxidase: no color change}\

\text {Motility: positive}& \text {TSI: $ \mathrm{K} / \mathrm{NC} $}\end{array}$

OF medium:
Open tubes: glucose: yellow, lactose: yellow, maltose: yellow
Closed tubes: glucose: green, lactose: green, maltose: green
When assessing the organisms's clinical significance, it is probably

Quizplus · Accepted Answer

The organism is a Pseudomonas species, which are typically opportunistic pathogens that can cause infections in immunocompromised patients. The organism is likely a colonizer in this case, as it is not causing any symptoms and is not resistant to antibiotics.

A Yellow-Pigmented Gram-Negative Rod Is Isolated from the Tracheal Aspirate