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Diagnosis of Potomac horse fever (syn. equine neorickettsiosis) in 2 foals in southwestern Ontario

Potomac horse fever (PHF) is characterized by fever, depression, anorexia, ileus, diarrhea, and occasionally, laminitis. The disease is caused by infection with Neorickettsia risticii and/or N. findlayensis. Equids of all ages may be affected; however, the condition has not been well-characterized i...

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Published in:The Canadian veterinary journal = La revue veterinaire canadienne 2023, Vol.64 (12), p.1129-1132
Main Authors: tin-Trahan, Rosalie, Sjolin, Erika, Lack, Amy, de Arbina, Cristina Lopez, McFadden-Bennett, Amy, Wang, Lidan, Baird, John D, Rikihisa, Yasuko, Arroyo, Luis G
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container_title The Canadian veterinary journal = La revue veterinaire canadienne
container_volume 64
creator tin-Trahan, Rosalie
Sjolin, Erika
Lack, Amy
de Arbina, Cristina Lopez
McFadden-Bennett, Amy
Wang, Lidan
Baird, John D
Rikihisa, Yasuko
Arroyo, Luis G
description Potomac horse fever (PHF) is characterized by fever, depression, anorexia, ileus, diarrhea, and occasionally, laminitis. The disease is caused by infection with Neorickettsia risticii and/or N. findlayensis. Equids of all ages may be affected; however, the condition has not been well-characterized in foals. This report describes clinical signs, laboratory findings, and treatment of 2 foals diagnosed with PHF in southwestern Ontario. Feces submitted for an equine PCR panel tested positive for Neorickettsia spp. and were subsequently confirmed to be N. risticii (Case 1) and N. findlayensis (Case 2). Both foals recovered following hospitalization and intensive care. Key clinical message: The purpose of this report is to make veterinarians aware that foals may develop PHF. During summer (July to September), when encountering foals in endemic areas with clinical signs compatible with PHF, veterinarians should consider PHF as a diagnostic rule-out. For confirmation of the diagnosis, blood and feces should be submitted for PCR testing for Neorickettsia spp.
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title Diagnosis of Potomac horse fever (syn. equine neorickettsiosis) in 2 foals in southwestern Ontario
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