University of Central Florida (UCF) MCB2004 Microbiology for Health Professionals Practice Exam 2

Candidiasis is the common fungal infection caused by Candida albicans. This organism is a type of yeast that normally resides in small amounts in the human body without causing harm. However, under certain conditions, such as a weakened immune system, antibiotic use, or hormonal changes, Candida can proliferate and lead to infections. Candidiasis can manifest in various forms, most commonly as oral thrush, vaginal yeast infections, or invasive candidiasis affecting the bloodstream and organs.

The other options refer to different types of fungal infections. Ringworm is caused by dermatophytes, a group of fungi that do not include Candida species. Athlete’s foot is specifically a fungal infection resulting from dermatophytes that affect the skin on the feet. Histoplasmosis is caused by Histoplasma capsulatum, a different fungus entirely that typically affects the lungs after inhalation of spores. Understanding these distinctions helps to illustrate why candidiasis is specifically linked to Candida albicans, as it is the yeast that directly causes this condition.