42-year-old patient with white plaques in the mouth; Sabouraud dextrose agar yields white creamy colonies; Wet prep shows chlamydospores and pseudohyphae; Germ tube shows no constriction. Which organism is suspected?

Prepare for the CAMLPR Microbiology Test. Utilize flashcards and engaging multiple-choice questions, each equipped with descriptions and explanations. Ready yourself for an excellent performance!

Differentiating Candida species using germ tube testing and microscopic morphology is the key idea here. The germ tube test helps separate Candida albicans, which is germ tube positive (germ tubes with no constriction at the base), from other Candida species that are germ tube negative. In this case, there is no constriction, so albicans is unlikely. The white, creamy colonies on Sabouraud dextrose agar fit a Candida species, and the wet prep showing pseudohyphae with chlamydospores points to a Candida that can form these structures but does not produce germ tubes. Among common non-albicans Candida, this pattern most consistently fits Candida krusei, which is germ tube negative and can display pseudohyphae with chlamydospores, matching the described morphology. Candida glabrata would typically lack pseudohyphae and chlamydospores, and Cryptococcus neoformans would present differently (encapsulated yeast with a mucoid colony).