KROK 1 2017 – Question 170 · KROK (Medicine) · Microbiology, Virology, and Immunology
On examination of a 6-year-old child the doctor noticed grayish film on the child’s tonsils. Microscopy of the smears stained by Neisser method detected there Corynebacterium diphtheriae. What morphologic feature was the most indicative for determining the type of the agent?
- A. Polar placement of volutin granules
- B. Spores that exceed cells in diameter
- C. Fence-like position of the agent’s cells
- D. Localization of the causative agent within macrophages
- E. Presence of the capsule
Hint
Think about what the special Neisser stain is designed to highlight inside this bacillus, rather than its cell wall, shape or growth habit.
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