Abstract
This article reports a new case of protothecosis by Prototheca wickerhamii in goats. The animal presented severe respiratory difficulty and nodules, sometimes ulcerated, in the nasal vestibule, mucocutaneous junction of the nostrils and skin of the face. Prototheca wickerhamii was isolated from the lesions. The animal had no clinical or haematologiccl evidence of immunodepression. The agent was highly resistant to antimicrobial drugs. The goat was treated unsuccessfully with fluconazole and euthanised 10 months after the diagnosis of the disease. Histological lesions were necrotising pyogranulomatous dermatitis, rhinitis and osteomyelitis with myriads of walled sporangia characteristic of P. wickerhamii. It is suggested that in goats, protothecosis is characterised by a chronic, slowly progressive infection, which affects immunologically competent goats, causing multifocal, ulcerative, pyogranulomatous and necrotising lesions of the mucosa of the nasal vestibule, mucocutaneous junctions of the nostrils and skin of the face.
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