Outbreaks of Pythiosis in Two Flocks of Sheep in Northeastern Brazil

Two outbreaks of cutaneous pythiosis caused by Pythium insidiosum were diagnosed in two herds of crossbred hair wool sheep of different ages in the semiarid region of Northeastern Brazil. In one herd of 120 sheep, 40 were affected. The other outbreak affected six sheep out of 80. Local swellings wit...

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Published inVeterinary pathology Vol. 41; no. 4; pp. 412 - 415
Main Authors Tabosa, I. M., Riet-Correa, F., Nobre, V. M. T., Azevedo, E. O., Reis-Júnior, J. L., Medeiros, R. M. T.
Format Journal Article
LanguageEnglish
Published Los Angeles, CA SAGE Publications 01.07.2004
Subjects
Animals
Bone and Bones - microbiology
Brazil - epidemiology
Dermatomycoses - drug therapy
Dermatomycoses - epidemiology
Dermatomycoses - microbiology
Dermatomycoses - veterinary
Disease Outbreaks - veterinary
Immunohistochemistry - veterinary
Lung - microbiology
Lymph Nodes - microbiology
Potassium Iodide - therapeutic use
Pythium - isolation & purification
Sheep
Sheep Diseases - drug therapy
Sheep Diseases - epidemiology
Sheep Diseases - microbiology
Skin - microbiology
Brazil
skin
Cromista
Pythium insidiosum
sheep
cutaneous pythiosis
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Summary:Two outbreaks of cutaneous pythiosis caused by Pythium insidiosum were diagnosed in two herds of crossbred hair wool sheep of different ages in the semiarid region of Northeastern Brazil. In one herd of 120 sheep, 40 were affected. The other outbreak affected six sheep out of 80. Local swellings with ulcerative lesions were observed in the limbs and abdominal and prescapular regions. Three sheep were necropsied. Two of them had lung metastasis characterized by multifocal nodules measuring 0.5–2 cm. In one animal, the prescapular lymph node was also affected. In another, the cutaneous lesion extended to the sesamoid bone. Microscopically, there were multifocal granulomas with intralesional P. insidiosum hyphae and Splendore-Hoeppli material surrounding the hyphae. The diagnosis was based on the histologic lesions, immunohisto-chemical identification, and culture of the etiologic agent. One sheep treated with potassium iodide recovered. Standing in swampy water for long periods in a warm aquatic environment seems to be the reason for the high prevalence of the disease.
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ISSN:0300-9858
1544-2217
DOI:10.1354/vp.41-4-412