VII. SUBCUTANEOUS FUNGI

• Humans acquire the infections from _____ contaminated with the fungi.

• The _____ are commonly affected.

• vegetation

• feet

• Subcutaneous mycoses are mainly caused by ______, which is a group of slowly growing fungi found in the soil and vegetation.

• _____ refers to hyphae that appear darkly pigmented, olive green, brown, and black when viewed microscopically.

• dematiaceous fungi

• “Dematiaceous”

•  A granulomatous fungal or bacterial infection of the subcutaneous tissue causing cutaneous abscesses

Mycetoma

Mycetoma

• Fungal mycetoma is called _____

• Bacterial form is called ____

• Exudate from mycetomas will contain red, yellow, or black _____.

• Most eumycetoma infections are found in Africa.

• Causative agents include ____

• eumycetoma

• actinomycetoma

• granules

• Pseudoallescheria boydii, Exophiala, Acremonium, and Madurella.

•  A localized infection characterized by chronic, hard or tumorlike lesions.

• Most infections involve the feet or lower legs.

• It is seen mostly in tropical areas

Chromoblastomycosis

Chromoblastomycosis

• Most infections are caused by ____

• Other fungi causing chromoblastomycosis are ____.

• The presence of ___ (copper-colored fungal cells) in lesions is characteristic.

• Colonies are folded or heaped and are gray to black.

• Fonsecaea pedrosoi.

• Phialophora, Cladosporium, Exophiala, and Wangiella

• sclerotic bodies

• A superficial or subcutaneous infection that can become systemic.

• Resulting systemic infections can cause endocarditis and brain abscesses

Phaeohyphomycosis

Phaeohyphomycosis

• Fungi causing phaeohyphomycosis include _____.

• _____, a dematiaceous fungus generally considered a saprophyte, has been associated with some cutaneous infections

• Bipolaris, Curvularia, and Phialophora

• Alternaria

• A subcutaneous infection; lymph and pulmonary infections can also occur.

• Known as rose gardener’s disease.

• Infections can come from rose thorns and contact with sphagnum moss

Sporotrichosis

Sporotrichosis

• _____ the cause of sporotrichosis, is a dimorphic fungus.

• When grown on media with ___ at ___ these fungi grow as small yeasts.

• When grown on ___ or ____ at ____ they are in the mold phase characterized by delicate hyphae and microconidia.

• Yeast cells may be seen in segmented neutrophils and are “____”

• Sporothrix schencki

• blood at 35°C

• SDA or PDA at room temperature

• cigar shaped.