Fatal disseminated blastomycosis in a free-ranging American black bear (Ursus americanus)

Jaclyn A. Dykstra, Lynn L. Rogers, Susan A. Mansfield, Arno Wünschmann

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An aged, free-ranging, female, radio-collared American black bear (Ursus americanus) died after an approximately 5 month long period of weight loss. Gross necropsy findings included severe diffuse pyogranulomatous bronchopneumonia, marked granulomatous lymphadenitis of tracheobronchial lymph nodes and multiple intra-abdominal lymph nodes, chronic focal jejunal ulceration, and widespread alopecia. Histopathologic examination revealed abundant fungal organisms morphologically compatible with Blastomyces sp. within pyogranulomatous inflammatory lesions in the lungs, multiple lymph nodes, liver, kidneys, jejunum, and right adrenal gland. In addition, the haircoat had a mild infestation of chewing lice (Trichodectes pinguis euarctidos), and large numbers of rhabditid nematodes consistent with Pelodera sp. were histologically observed within hair follicles.

Original languageEnglish (US)
Pages (from-to)1125-1128
Number of pages4
JournalJournal of Veterinary Diagnostic Investigation
Issue number6
StatePublished - Nov 2012


  • Black bears
  • Blastomyces sp.
  • Pelodera sp.
  • Ursus americanus
  • blastomycosis

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