California Cosmetology Written ExamSafety and Infection ControlEasy
A client develops a scaly, itchy patch of hair loss on the scalp. Lab testing shows the condition is caused by a microorganism that feeds on keratin and thrives in warm, moist environments. Which pathogen category caused this condition?
- AVirus
- BProtozoan
- CRickettsia
- DFungus
Show answer & explanationAnswer & explanation
Correct answer: D. Fungus
Fungi are keratin-feeding, plant-like organisms that cause conditions such as tinea (ringworm) and onychomycosis. Unlike bacteria or viruses, fungi form spores and molds that thrive in warm, moist conditions common in salons.
Why the other options are wrong
- A. Viruses cannot reproduce outside a living host cell and don't feed on keratin.
- B. Protozoa are single-celled animal-like organisms, not associated with keratin infections.
- C. Rickettsia are bacteria-like organisms spread by insect bites, not keratin feeders.
Fungi (Dermatophytes)
Fungi are microorganisms that feed on keratin and cause conditions such as ringworm (tinea) and nail fungus; they thrive in warm, damp environments.
- Includes molds and yeasts
- Cause tinea capitis, tinea pedis, onychomycosis
- Client with active fungal infection must be refused service
Memory trick: Fungi = 'Fun-Gi' munching on keratin like a hungry mushroom.