A gram negative rod from a ventilator-associated pneumonia is oxidase positive, does not ferment lactose, and produces a green pigment with a grape-like odor. Which organism is most likely?
1Acinetobacter baumannii
2Stenotrophomonas maltophilia
3Pseudomonas aeruginosa✓ 정답
4Klebsiella pneumoniae
해설
A positive oxidase reaction already excludes the Enterobacteriaceae. Adding green pigment and the characteristic odor identifies Pseudomonas aeruginosa. Acinetobacter is oxidase negative and differs in morphology and growth characteristics.