KROK 1 2009 – Question 191 · KROK (Medicine) · Microbiology, Virology, and Immunology
After inoculation of the material obtained from the pharynx of an angina patient onto the blood-tellurite agar, grey colonies could be observed. They were 4-5 mm in diameter, radially striated (in form of rosettes). Microscopical examination revealed gram-positive bacilli with clavate swollen ends arranged in form of wide-spread fingers. Identify these microorganisms:
- A. Clostridium botulinum
- B. Streptobacilli
- C. Diphtheroids
- D. Diphtheria corynebacteria
- E. Streptococci
Hint
Combine the selective medium, the colony appearance and the characteristic arrangement of the club-ended rods to identify the pathogen, and consider which look-alikes are harmless.
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