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Microbiology 23

A 2-year-old boy is brought to the physician because of 2‐day history of musky smelling urine, irritability, and decreased appetite. He has a past medical history of a congenital ureteral stricture. He has been treated with antibiotics for recurrent urinary tract infections. in the past 6 months. Vital signs are temperature is 37.8°C (100.04°F), pulse 80 beats/min, and respirations 20/min. Physical examination shows mild suprapubic tenderness. Laboratory studies show gram-negative motile rods which are urease and nitrite test positive.

Which of following laboratory characteristics will most likely also be observed with the causal agent?

  • A) Catalase positive, swarming colonies on solid agar
  • B) H2S negative, pink mucoviscous colonies on MacConkey agar
  • C) Oxidase negative, green iridescent colonies on eosin-methylene blue (EMB) agar
  • D) Oxidase negative, no growth on MacConkey agar
  • E) Oxidase negative, pink colonies on MacConkey agar


Brandon Sigamony


Dr. Ted O'Connell

Last updated

Jun 06, 2024

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