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Microbiology

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Gram Negative Bacilli

Question
40 out of 81
 

A 78-year-old patient with an episode of acute urinary retention was catheterizeD. Three days later, he developed fever and suprapubic pain. Culture of the urine revealed a thin film of bacterial growth over the entire blood agar plate, and the urease test was positive. Which of the following is the most likely organism to cause this infection? (AIPG 2010)



A Escherichia coli
B Helicobacter pylori

C Morganella morganii
D Proteus mirabilis

Ans. D Proteus mirabilis

a. Proteus species produce infections in humans only when the bacteria leave the intestinal tract.

b. They are found in urinary tract infections and produce bacteremia, pneumonia, and focal lesions in debilitated patients or those receiving intravenous infusions.

c. P. mirabilis is a common cause of urinary tract infections. Proteus species produce urease, making urine alkaline and promoting stone formation.

d. The rapid motility of these organisms is evidenced by "swarming," a thin film of organisms over the entire agar plate. Dienes phenomenon is associated with Proteus.

Gram Negative Bacilli Flashcard List

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