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 flat gray colony that is oxidase, catalase, and indole positive
B) An orange spreading colony that is oxidase positive, catalase negative, and indole positive
C) A yellow, spreading colony that is oxidase and catalase positive and indole negative
D) A small, dry embedded colony that is oxidase, catalase, and indole negative
Question 2
A major advantage of the use a DNA vaccine rather than a conventional vaccine is
A) its low cost.
B) that it is safer than use of a live vaccine.
C) its ease of delivery.
D) that it does not rely on the host's immune system to function.
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