A veterinarian presents with a purulent hand wound. The direct Gram stain reveals a gram-negative coccobacillus. On culture, the organism grows on sheep blood and chocolate agars in CO2 but not on MacConkey agar. Which of the following profiles can be used to presumptively identify this organism?
A) A yellow, spreading colony that is oxidase and catalase positive and indole negative
B) A flat gray colony that is oxidase, catalase, and indole positive
C) A small, dry embedded colony that is oxidase, catalase, and indole negative
D) An orange spreading colony that is oxidase positive, catalase negative, and indole
positive
Correct Answer:
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