Blastomyces dermatitidis Infection

Pulmonary lesions, consisting of multifocal to coalesc­ing gray-white nodules, due to Blastomyces spp. infection have been documented in a laboratory rat. Microscopic findings included bronchopneumonia with multifocal pyogranulomas containing thick-walled yeast forms.

Speciation of the causative agent was achieved by PCR and DNA sequencing. The source of infection was not found.