Which organism is known to cause thrush and vaginitis in an immunocompromised patient?

• A. Aspergillus fumigatus
• B. Histoplasma capsulatum
• C. Cryptococcus neoformans
• D. Candida albicans

Answer: (D)

Candia albicans is the organism most commonly responsible for mucosal fungal infections like thrush (oral candidiasis) and vaginal candidiasis, especially when the immune system is compromised. It normally lives on mucous membranes as a harmless yeast, but when defenses are lowered or the normal bacterial balance is disrupted, it can overgrow and produce those characteristic mucosal symptoms.

The other fungi listed cause different diseases in immunocompromised patients. Aspergillus fumigatus tends to cause invasive pulmonary disease; Histoplasma capsulatum causes histoplasmosis often in the lungs and reticuloendothelial system; Cryptococcus neoformans commonly leads to meningitis or pneumonia, particularly in AIDS. These do not produce the classic thrush or vaginal candidiasis presentation.