An HIV positive female presents with an indurated ulcer over the tongue. Laboratory findings show growth in cornmeal agar at 20-degree Celsius, microscopy showing hyphae and growth in human serum at 37-degree celsius show budding yeasts. The probable cause is

Candidiasis is an oppounistic endogenous infection. Germ tube test - Candida albicans has the ability to form germ tubes within 2hrs when incubated in human serum at 37C. Chlamydospores- it develops in cornmeal agar at 20C at the end of pseudohyphae. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition .