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Cryptococcosis in seven horses.

C B Riley1, J R Bolton, J N Mills

  • 1School of Veterinary Studies, Murdoch University, Western Australia.

Australian Veterinary Journal
|June 1, 1992
PubMed
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Equine cryptococcosis, a fungal infection affecting horses, presents as pneumonia or abdominal granulomas. Cryptococcus neoformans var gattii was identified, and cases carry a poor prognosis.

Area of Science:

  • Veterinary Mycology
  • Equine Pathology

Background:

  • Cryptococcosis is a fungal infection caused by Cryptococcus species.
  • Equine cases are rare, with limited data on clinical presentation and outcomes.

Observation:

  • This study describes clinical, radiographic, and post-mortem findings in seven horses with cryptococcosis.
  • Lesions included pulmonary cryptococcosis (diffuse or localized) and abdominal cryptococcal granuloma.
  • Encapsulated yeast-like organisms were identified in tracheal washes and fine needle aspirates.

Findings:

  • Two distinct forms of pulmonary cryptococcosis were observed: diffuse/multiple and localized.
  • Hematogenous spread from gastrointestinal infection was hypothesized for diffuse cases, while inhalation was suggested for localized cases.
  • Cryptococcus neoformans var gattii was isolated from two horses.

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Implications:

  • Equine cryptococcosis, particularly with C. neoformans var. gattii, has a poor prognosis.
  • Potential association with Eucalyptus species warrants further investigation.
  • Early diagnosis and understanding of transmission routes are crucial for managing equine fungal infections.