BEND, OR — State veterinary disease tracking networks have flagged a cluster of Corynebacterium pseudotuberculosis infections—commonly known as Pigeon Fever—in Deschutes County, Oregon. Official surveillance reports confirm one laboratory-verified case and five suspect cases presenting with compatible clinical signs across local horse herds.
Etiology & Transmission Mechanisms
Pigeon Fever is caused by the soil-borne gram-positive bacterium Corynebacterium pseudotuberculosis. The pathogen enters via skin abrasions, insect bites (flies and midges), or contaminated equipment, causing deep subcutaneous abscesses—most commonly in the pectoral region (“pigeon breast”) and ventral abdomen—as well as ulcerative lymphangitis in the limbs.
Key Details of the Outbreak
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The Hotspot: Deschutes County has seen a localized surge, with continuous new cases being reported to the Equine Disease Communication Center (EDCC)
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Statewide Impact: The ODA and the Oregon Veterinary Medical Association (OVMA) have verified that the infection is spiking throughout central and eastern Oregon
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Official Action: Affected horses are being placed under official quarantine to contain the spread. Pigeon fever is an immediately reportable disease in Oregon
Industry & Practice Implications:
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Diagnostic Verification: Equine clinicians evaluating compatible pectoral or ventral abscesses should perform bacterial culture and sensitivity testing rather than relying solely on visual examination. Suspect cases must be isolated until laboratory results arrive.
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Biosecurity & Fly Control: Because C. pseudotuberculosis survives in soil for months and spreads via mechanical fly vectors, practices should recommend fly repellents, wound care, and strict sanitation of grooming tools.
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Case Distinction: Veterinary managers must maintain a clear distinction between the single laboratory-confirmed case and the five unconfirmed suspect cases when advising clients on local exposure risks.
