MLT GlobeMycology – page 5
83 Mycology MCQs with answers and explanations.
A yeast-like isolate from blood produces arthroconidia and blastoconidia on cornmeal agar and is urease positive. The most likely genus is:
Answer: C. Trichosporon
Trichosporon produces both arthroconidia and blastoconidia and is urease positive. Geotrichum forms arthroconidia without blastoconidia and is urease negative.
ID MG-MYC-0034 · Found a mistake? Report it
Serum (1,3)-beta-D-glucan is positive in many invasive fungal infections but is characteristically LOW or negative in infection with:
Answer: A. Mucorales and Cryptococcus
Mucorales contain little beta-D-glucan and Cryptococcus is masked by its capsule, so the test is often negative. Pneumocystis, Candida and Aspergillus usually give positive results.
ID MG-MYC-0037 · Found a mistake? Report it
A cryptococcal isolate turns canavanine-glycine-bromothymol blue (CGB) agar blue. This identifies the isolate as:
Answer: D. Cryptococcus gattii
C. gattii resists canavanine and uses glycine, raising the pH so the indicator turns blue; C. neoformans leaves the medium yellow-green. The distinction matters for epidemiology and prognosis.
ID MG-MYC-0043 · Found a mistake? Report it
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