KROK 1 2021 – Question 105 · KROK (Medicine) · Microbiology, Virology, and Immunology
Feces of a child with an acute intestinal infection were inoculated onto Endo medium, which resulted in the growth of numerous raspberry-red colonies with a metallic sheen. It indicates that the colibacillus is the likely causative agent of the disease. What property of the causative agent was used to distinguish it from other intestinal bacteria?
- A. Toxigenicity
- B. Capsule formation
- C. Fermentation of lactose
- D. Antigenic structure
- E. Oxidase activity
Hint
Endo agar contains a sugar and a colour indicator; think about what the red colonies with a metallic sheen reveal about the metabolism of the bacteria.
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