KROK 1 Stomatology 2012 – Question 147 · KROK (Dentistry)
A sample taken from the pharynx of a patient with angina was inoculated on the blood-tellurite agar. This resulted in growth of grey, radially striated (in form of rosettes) colonies up to 4-5 mm in diameter. Microscopically there can be seen gram-positive rods with club-shaped ends arranged in form of spread fingers. What microorganisms are these?
- A. Clostridium botulinum
- B. Corynebacterium diphtheriae
- C. Streptococci
- D. Diphtheroids
- E. Streptobacilli
Hint
Combine the tellurite medium, the rosette-like grey colonies and the club-shaped Gram-positive rods arranged at angles in a patient with sore throat.
The answer, the explanation and a note on every option are available once you log in. The account is free: topic tests, a mock exam, mistake review and statistics.