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Klebsiella, Enterobacter, and other hospital Enterobacterales
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A 72-year-old man develops fever and a new pulmonary infiltrate after 8 days of mechanical ventilation. A lower respiratory specimen grows gram-negative rods that are oxidase negative, ferment glucose, and form large mucoid pink colonies on MacConkey agar. Motility testing is negative. The specimen contains numerous neutrophils.