What type of pathogen is Stenotrophomonas maltophilia?

Stenotrophomonas maltophilia is classified as a Gram-negative nonfermentative rod. This means that when subjected to Gram staining, it does not retain the crystal violet dye but instead takes up the counterstain, appearing pink under the microscope. Additionally, it does not ferment carbohydrates, which distinguishes it from other types of bacteria that may utilize sugars for energy through fermentation processes.

Stenotrophomonas maltophilia is known for its role as an opportunistic pathogen, particularly in immunocompromised individuals. Its nonfermentative metabolism allows it to survive in various environments, including clinical settings, where it may be associated with respiratory infections and other healthcare-related infections. Understanding its classification is crucial for proper identification in the laboratory and for informing treatment decisions, as this organism often exhibits resistance to multiple antibiotics.

The other options reflect different classes of bacteria that do not accurately describe Stenotrophomonas maltophilia's characteristics. Gram-positive cocci and Gram-positive bacilli refer to organisms that retain the crystal violet stain, which is not the case here. Similarly, a Gram-negative fermentative bacillus would imply the ability to ferment carbohydrates, which does not apply to this pathogen. Thus, recognizing Stenotrophomon