BACKGROUND: Pythium insidiosum is an oomycete that causes cutaneous lesions or infiltrative gastrointestinal disease in dogs, cats, humans, horses and other mammals, primarily in tropical and subtropical climates. HYPOTHESIS/ OBJECTIVES: We report the clinicopathological findings associated with cutaneous pythiosis in two dogs from a Northern temperate climate zone. ANIMALS: A 3-year-old intact male Chesapeake Bay retriever was presented with an ulcerated soft-tissue swelling over the left eye. A 4-year-old spayed female German shepherd dog was presented with a soft-tissue swelling overlying the right hock. Both dogs lived in northern latitudes (between 43 and 45°N) and neither had travelled outside of Wisconsin or Michigan's upper peninsula, USA. METHODS: Histopathological examination and culture of affected tissues on specialized media, serology for anti-P. insidiosum antibodies, P. insidiosum-specific PCR and ribosomal RNA gene sequencing were carried out. RESULTS: Histopathological examination revealed pyogranulomatous and eosinophilic inflammation associated with wide, poorly septate hyphae. CONCLUSIONS AND CLINICAL IMPORTANCE: Even clinicians who practice in temperate climates should consider pythiosis as a differential diagnosis for young to middle-aged adult dogs presented with ulcerated cutaneous nodules or infiltrative gastrointestinal disease.
BACKGROUND:Pythium insidiosum is an oomycete that causes cutaneous lesions or infiltrative gastrointestinal disease in dogs, cats, humans, horses and other mammals, primarily in tropical and subtropical climates. HYPOTHESIS/ OBJECTIVES: We report the clinicopathological findings associated with cutaneous pythiosis in two dogs from a Northern temperate climate zone. ANIMALS: A 3-year-old intact male Chesapeake Bay retriever was presented with an ulcerated soft-tissue swelling over the left eye. A 4-year-old spayed female German shepherd dog was presented with a soft-tissue swelling overlying the right hock. Both dogs lived in northern latitudes (between 43 and 45°N) and neither had travelled outside of Wisconsin or Michigan's upper peninsula, USA. METHODS: Histopathological examination and culture of affected tissues on specialized media, serology for anti-P. insidiosum antibodies, P. insidiosum-specific PCR and ribosomal RNA gene sequencing were carried out. RESULTS: Histopathological examination revealed pyogranulomatous and eosinophilic inflammation associated with wide, poorly septate hyphae. CONCLUSIONS AND CLINICAL IMPORTANCE: Even clinicians who practice in temperate climates should consider pythiosis as a differential diagnosis for young to middle-aged adult dogs presented with ulcerated cutaneous nodules or infiltrative gastrointestinal disease.
Authors: Krystle L Reagan; Stanley L Marks; Patricia A Pesavento; Ann Della Maggiore; Bing Y Zhu; Amy M Grooters Journal: J Vet Intern Med Date: 2019-04-19 Impact factor: 3.333
Authors: Nelly O Elshafie; Jessica Hanlon; Mays Malkawi; Ekramy E Sayedahmed; Lynn F Guptill; Yava L Jones-Hall; Andrea P Santos Journal: Vet Sci Date: 2022-08-19