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Blastomyces spp. is a topic covered in the Johns Hopkins ABX Guide.

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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.
  • Blastomycosis:
    • Blastomyces dermatiditis: usually strikes immunocompetent people.
    • B.gilchristii
    • 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[2].
      • Cutaneous findings not yet described with this species.
      • This species may be misdiagnosed as H. capsulatum or B. dermatitidis.

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Last updated: March 5, 2019


Auwaerter, Paul G, and John G Bartlett. "Blastomyces Spp." Johns Hopkins ABX Guide, The Johns Hopkins University, 2019. Johns Hopkins Guide, www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540059/all/Blastomyces_spp_.
Auwaerter PG, Bartlett JG. Blastomyces spp. Johns Hopkins ABX Guide. The Johns Hopkins University; 2019. https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540059/all/Blastomyces_spp_. Accessed August 21, 2019.
Auwaerter, P. G., & Bartlett, J. G. (2019). Blastomyces spp. In Johns Hopkins ABX Guide. Available from https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540059/all/Blastomyces_spp_
Auwaerter PG, Bartlett JG. Blastomyces Spp [Internet]. In: Johns Hopkins ABX Guide. The Johns Hopkins University; 2019. [cited 2019 August 21]. Available from: https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540059/all/Blastomyces_spp_.
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TY - ELEC T1 - Blastomyces spp. ID - 540059 A1 - Auwaerter,Paul,M.D. AU - Bartlett,John,M.D. Y1 - 2019/03/05/ BT - Johns Hopkins ABX Guide UR - https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540059/all/Blastomyces_spp_ PB - The Johns Hopkins University DB - Johns Hopkins Guide DP - Unbound Medicine ER -