Fungus
Fusarium species
Hyaline mold; keratitis and neutropenic fungemia
fyoo-ZAIR-ee-um
High-yield clue
Banana- or canoe-shaped multicellular macroconidia plus fungemia with skin lesions in neutropenia (positive blood cultures) is the core study clue.
Overview
A widespread environmental hyaline mold with septate hyphae that causes fungal keratitis, especially in contact-lens wearers, and disseminated fusariosis in profoundly neutropenic hosts. It is a key hyalohyphomycosis teaching organism.
Classification
- Hyaline (non-pigmented) mold
- Septate hyphae, often acute branching
- Produces sickle/banana-shaped macroconidia
- Ascomycota
- Angioinvasive opportunist
Lab & identification clues
- Banana- or canoe-shaped multicellular macroconidia vocabulary
- Septate hyaline hyphae distinction from aseptate molds
- Often recoverable from blood culture, unlike Aspergillus
- Adventitious sporulation in tissue vocabulary
Associations
- Fungal keratitis linked to contact-lens and eye-trauma vocabulary
- Disseminated fusariosis with painful skin nodules in neutropenia
- Onychomycosis and localized skin infection vocabulary
- Environmental exposure from plants, soil, and water
Commonly confused with
- Aspergillus fumigatus (septate hyaline mold)
- Scedosporium species (hyaline mold)
Frequently asked questions
What is Fusarium species?
A widespread environmental hyaline mold with septate hyphae that causes fungal keratitis, especially in contact-lens wearers, and disseminated fusariosis in profoundly neutropenic hosts. It is a key hyalohyphomycosis teaching organism.
What are the lab clues for Fusarium species?
Lab clues for Fusarium species include Banana- or canoe-shaped multicellular macroconidia vocabulary; Septate hyaline hyphae distinction from aseptate molds; Often recoverable from blood culture, unlike Aspergillus; Adventitious sporulation in tissue vocabulary.
What is Fusarium species commonly confused with?
Fusarium species is commonly confused with Aspergillus fumigatus (septate hyaline mold) and Scedosporium species (hyaline mold).
Original student-study summary. Sources checked: OpenStax Microbiology 2e, NCBI Bookshelf Medical Microbiology, and CDC topic pages where applicable; reviewed 2026-06. Educational only; no diagnosis, treatment, dosing, or specimen-handling guidance.