Equine laryngeal rhinosporidiosis in western Canada.

The research article discusses a case of a respiratory disease called rhinosporidiosis in a horse from Canada, which likely contracted the disease in Argentina, highlighting the potential risks of spreading diseases due to movement of humans and animals.

Case Presentation and Diagnosis

• The article begins by presenting the case of a 12-year old female Argentinean Warmblood mare residing in Calgary, Canada. This horse has been imported from Argentina 28 months prior and was evaluated due to a respiratory noise, which was a sign of a potential health issue.
• An in-depth examination of the upper respiratory tract through a procedure commonly known as endoscopy revealed a single polypoid mass (a growth or tumor-like protrusion) on the left arytenoid (a part of the larynx).
• The polypoid mass was surgically removed and, when examined under a microscope (a histological study), it was diagnosed as a case of rhinosporidiosis, a uncommon chronic infection mostly seen in tropical regions.
• The researchers used a DNA replication process called Polymerase Chain Reaction as well as DNA sequencing to confirm the cause of the disease, bolstering the initial diagnosis.

Disease Recurrence and Implications

• Four weeks after the surgical removal of the mass, a follow-up endoscopy showed recurrence of the original lesion and presence of multiple additional polypoid masses on the larynx and in the oropharynx. As of the time of writing this report, the researchers had not achieved a resolution of the disease.
• The research put a spotlight on the fact that the disease manifested in a horse located in a geographical area where this type of infection is uncommon, which indicates that it was most likely contracted during the horse’s time in Argentina, suggesting a long period of the disease being present without visible symptoms.
• On a larger scale, the research highlights the risk associated with increased international movement of humans and animals. The horse’s case demonstrated how diseases can be transported from endemic regions to otherwise unaffected areas and create new instances of diseases or infections unforeseen in those regions.