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OBJECTIVE  To investigate the mycobiome of the oral cavity in healthy dogs and dogs with various stages of periodontal disease.    ANIMALS  51 dogs without periodontal disease (n = 12) or with mild (10), moderate (19), or severe (10) periodontal disease.    PROCEDURES  The whole maxillary arcade of each dog was sampled with a sterile swab, and swabs were submitted for next-generation DNA sequencing targeting the internal transcribed spacer 2 region with a commercial sequencing platform.    RESULTS  Fungi were detected in all samples, with a total of 320 fungal species from 135 families detected in the data set. No single fungal species was found in all samples. The 3 most frequently found fungal species were  Cladosporium  sp (46/51 samples),  Malassezia restricta  (44/51 samples), and  Malassezia arunalokei  (36/51 samples). Certain fungi, specifically those of the family Didymellaceae, the family Irpicaceae, and the order Pleosporales, were significantly associated with different stages of periodontitis. Mycobial analysis indicated that  Cladosporium  sp could be considered part of the core oral cavity mycobiome.    CONCLUSIONS AND CLINICAL RELEVANCE  Results highlighted that fungi are present in the oral cavity of dogs and are characterized by substantial species diversity, with different fungal communities associated with various stages of periodontal disease. The next-generation DNA sequencing used in the present study revealed substantially more species of fungi than previous culture-based studies.

The mycobiome of the oral cavity in healthy dogs and dogs with periodontal disease