KROK 1 2008 – Question 187 · KROK (Medicine) · Microbiology, Virology, and Immunology
Inoculum from pharynx of a patient ill with angina was inoculated into blood tellurite agar. It resulted in growth of grey, radially striated (in form of rosettes) colonies 4-5 mm in diameter. Gram-positive bacilli with clublike thickenings on their ends placed in form of spread wide apart fingers are visible by microscope. What microorganisms are these?
- A. Streptobacilli
- B. Streptococci
- C. Diphtheroids
- D. Diphtheria corynebacteria
- E. Botulism clostridia
Hint
Tellurite-containing medium favours the agent of a toxin-mediated throat infection; consider club-shaped Gram-positive rods lying at angles like spread fingers.
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