A Gram-Negative Bacillus That Is Hydrogen Sulfide (H₂S)-Positive, Citrate-Positive, Spot

question 1

Multiple Choice

A gram-negative bacillus that is hydrogen sulfide (H₂S) -positive, citrate-positive, spot indole-negative, and associated with gastroenteritis in the United States is most likely:

• A) Klebsiella pneumoniae.
• B) Proteus vulgaris.
• C) Salmonella enteritidis.
• D) Shigella sonnei.

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