Systemic Candidiasis in an Apparently Immunocompetent Dog

Abstract

Members of the family Candida spp. are ubiquitous dimorphic fungi that normally inhabit the alimentary, upper respiratory, and genital mucosae of mammals. Cell-mediated immunity appears to be an important limitation to the pathologic spread of these fungi. Prolonged immunosuppression, cytotoxic chemotherapy causing neutropenia, diabetes mellitus, long-term glucocorticoid therapy, and prolonged antimicrobial therapy have resulted in an increased incidence of both localized and disseminated candidiasis. This report describes a systemic Candida spp. infection in a dog with no obvious underlying deficiency in host resistance. Cytopathology, histopathology, transmission electron microscopy, and immunohistochemical staining were used to determine the etiology of the causative agent.