Esophagitis Due toPythium insidiosumInfection in Two Dogs

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Abstract
Chronic esophagitis due toPythium insidiosuminfection caused weight loss, dysphagia, and hypersalivation in 2 dogs from rural Tennessee. Although dog 1 presented for evaluation in December 1984 and dog 2 in October 1992, infection likely occurred during the previous summer by drinking fresh pond water containing zoospores. Hematologic testing revealed eosinophilia and hypergammaglobulinemia in one dog. An etiologic diagnosis was not made until postmortem evaluation when hyphae within necrotic and granulomatous cellular infiltrates in the esophageal wall were identified asP insidiosumby immunoperoxidase staining. Failure to culture the organism from the esophageal wall in dog 2 was attributed to refrigeration of the tissues, since refrigeration decreases the survivability ofP insidiosum. J Vet Intern Med 1996;10:139–742. Copyright © 1996 by the American College of Veterinary Internal Medicine.