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Suen WW, Zedler S, Price R, Maguire T, Halliday C, Rosenblatt AJ, Allavena RE, Owen H, Medina-Torres CE. Rhinosinusitis in an Australian mare caused by Flavodon flavus, a recently recognized invasive fungal pathogen of the horse. J Vet Diagn Invest 2019; 32:162-165. [PMID: 31876248 DOI: 10.1177/1040638719897610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We describe herein the clinical, endoscopic, computed tomography (CT), pathologic, and microbiologic features of an infection caused by an under-recognized fungal pathogen, Flavodon flavus, in a 25-y-old Australian Quarter Horse. The horse had a unilateral obstructive nasal mass, resulting in stertor and dyspnea. On endoscopy, the mass was tan, multinodular, and completely obstructed the nasal passage. CT analysis revealed a large, soft tissue-attenuating and partially mineralized mass in the right nasal passage and dorsal-conchofrontal sinus, expanding into adjacent paranasal sinuses with associated bone lysis and rhinosinusitis. Histopathology of the mass on 2 occasions revealed suppurative inflammation initially, and pyogranulomatous inflammation subsequently. The inflammatory reaction surrounded numerous spherical fungal structures (~60-80 µm diameter) that stained positively on periodic acid-Schiff and Grocott methenamine silver stains. PCR for the fungal internal transcribed spacer 1 and 2 regions followed by Sanger sequencing on a cultured isolate identified the agent as F. flavus, which has only been reported previously as pathogenic in one horse in the United States, to our knowledge. Previous reports described this fungus as a nonpathogenic, environmental commensal fungus associated with insects and plants.
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Affiliation(s)
- Willy W Suen
- School of Veterinary Science, Faculty of Science, The University of Queensland, Gatton, Queensland, Australia (Suen, Zedler, Price, Maguire, Rosenblatt, Allavena, Owen, Medina-Torres).,CSIRO Australian Animal Health Laboratory, Geelong, Victoria, Australia (Suen).,Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, New South Wales Health Pathology, Westmead Hospital, Sydney, New South Wales, Australia (Halliday)
| | - Steven Zedler
- School of Veterinary Science, Faculty of Science, The University of Queensland, Gatton, Queensland, Australia (Suen, Zedler, Price, Maguire, Rosenblatt, Allavena, Owen, Medina-Torres).,CSIRO Australian Animal Health Laboratory, Geelong, Victoria, Australia (Suen).,Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, New South Wales Health Pathology, Westmead Hospital, Sydney, New South Wales, Australia (Halliday)
| | - Rochelle Price
- School of Veterinary Science, Faculty of Science, The University of Queensland, Gatton, Queensland, Australia (Suen, Zedler, Price, Maguire, Rosenblatt, Allavena, Owen, Medina-Torres).,CSIRO Australian Animal Health Laboratory, Geelong, Victoria, Australia (Suen).,Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, New South Wales Health Pathology, Westmead Hospital, Sydney, New South Wales, Australia (Halliday)
| | - Tina Maguire
- School of Veterinary Science, Faculty of Science, The University of Queensland, Gatton, Queensland, Australia (Suen, Zedler, Price, Maguire, Rosenblatt, Allavena, Owen, Medina-Torres).,CSIRO Australian Animal Health Laboratory, Geelong, Victoria, Australia (Suen).,Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, New South Wales Health Pathology, Westmead Hospital, Sydney, New South Wales, Australia (Halliday)
| | - Catriona Halliday
- School of Veterinary Science, Faculty of Science, The University of Queensland, Gatton, Queensland, Australia (Suen, Zedler, Price, Maguire, Rosenblatt, Allavena, Owen, Medina-Torres).,CSIRO Australian Animal Health Laboratory, Geelong, Victoria, Australia (Suen).,Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, New South Wales Health Pathology, Westmead Hospital, Sydney, New South Wales, Australia (Halliday)
| | - Alana J Rosenblatt
- School of Veterinary Science, Faculty of Science, The University of Queensland, Gatton, Queensland, Australia (Suen, Zedler, Price, Maguire, Rosenblatt, Allavena, Owen, Medina-Torres).,CSIRO Australian Animal Health Laboratory, Geelong, Victoria, Australia (Suen).,Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, New South Wales Health Pathology, Westmead Hospital, Sydney, New South Wales, Australia (Halliday)
| | - Rachel E Allavena
- School of Veterinary Science, Faculty of Science, The University of Queensland, Gatton, Queensland, Australia (Suen, Zedler, Price, Maguire, Rosenblatt, Allavena, Owen, Medina-Torres).,CSIRO Australian Animal Health Laboratory, Geelong, Victoria, Australia (Suen).,Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, New South Wales Health Pathology, Westmead Hospital, Sydney, New South Wales, Australia (Halliday)
| | - Helen Owen
- School of Veterinary Science, Faculty of Science, The University of Queensland, Gatton, Queensland, Australia (Suen, Zedler, Price, Maguire, Rosenblatt, Allavena, Owen, Medina-Torres).,CSIRO Australian Animal Health Laboratory, Geelong, Victoria, Australia (Suen).,Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, New South Wales Health Pathology, Westmead Hospital, Sydney, New South Wales, Australia (Halliday)
| | - Carlos E Medina-Torres
- School of Veterinary Science, Faculty of Science, The University of Queensland, Gatton, Queensland, Australia (Suen, Zedler, Price, Maguire, Rosenblatt, Allavena, Owen, Medina-Torres).,CSIRO Australian Animal Health Laboratory, Geelong, Victoria, Australia (Suen).,Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, New South Wales Health Pathology, Westmead Hospital, Sydney, New South Wales, Australia (Halliday)
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