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- Thermally dimorphic fungus: mycelial in nature (room temperature) and yeast in tissue (37°C).
- Yeast form is 8 x 30 micron with broad-based budding [Fig 1], differentiates from Histoplasma narrow-based budding.
- Fungus especially found in moist, acid soils in forests, decomposing matter.
- Blastomyces dermatiditis: usually strikes immunocompetent people.
- B. helicus (previously Emmonsia helicus): this organism does not appear to produce conidia. Described to date as a rare cause of often disseminated human infection in the Western U.S., Rocky Mountains, Western Canada, and in immunocompromised hosts--differentiating from B. dermatitidis.
- Cutaneous findings not yet described with this species.
- This species may be misdiagnosed as H. capsulatum or B. dermatitidis.