A yeast-like organism isolated from a sputum specimen on cornmeal agar produces mycelia with thick-walled terminal chlamydoconidia. The organism is most likely which species?

A yeast-like organism isolated from a sputum specimen on cornmeal agar produces mycelia with thick-walled terminal chlamydoconidia. The organism is most likely which species?

• A. Candida albicans
• B. Candida glabrata
• C. Cryptococcus neoformans
• D. Saccharomyces cerevisiae

Answer: (A)

Chlamydospore formation on cornmeal agar is a key diagnostic clue for Candida albicans. On this medium, C. albicans often grows as yeast with mycelial elements and produces thick-walled, terminal chlamydospores (chlamydoconidia) at the ends of hyphae. This distinctive morphology—mycelial growth accompanied by these large, thick-walled spores at the tips—strongly points to C. albicans. Other yeasts, such as Candida glabrata, typically do not form chlamydospores; Cryptococcus neoformans appears as encapsulated yeast and does not characteristically produce chlamydospores on cornmeal agar; Saccharomyces cerevisiae is mainly noted for budding yeast forms and does not rely on chlamydospore production for identification. Thus, the described morphology aligns best with Candida albicans.

Chlamydospore formation on cornmeal agar is a key diagnostic clue for Candida albicans. On this medium, C. albicans often grows as yeast with mycelial elements and produces thick-walled, terminal chlamydospores (chlamydoconidia) at the ends of hyphae. This distinctive morphology—mycelial growth accompanied by these large, thick-walled spores at the tips—strongly points to C. albicans. Other yeasts, such as Candida glabrata, typically do not form chlamydospores; Cryptococcus neoformans appears as encapsulated yeast and does not characteristically produce chlamydospores on cornmeal agar; Saccharomyces cerevisiae is mainly noted for budding yeast forms and does not rely on chlamydospore production for identification. Thus, the described morphology aligns best with Candida albicans.