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Two outbreaks of zigomycosis with rhinofacial and two other with rhinopharyngeal lesions involving fungi with filamentous coaenocytic hyphae characteristic of entomoph-thoramycetous fungi are reported in the state of Paraíba, northeastern Brazil. One outbreak of rhinofacial zygomycosis occurred during the rainy season affecting 5 sheep. Another outbreak of the clinical form affected one out of 40 sheep during the dry season. Common clinical signs of the rhinofacial infection were bilateral serosanguineous nasal discharge with swelling of nostrils, upper lip, and the skin of the face. At necropsy the nasal mucosa showed dark brownish ulcerated areas which extended from the mucocutaneous region to 10cm inside the nasal vestibule. The mucosa of the hard palate was also ulcerated. The cutting surface of nostrils and palate showed a brownish or red spongeous tissue of friable consistency. One outbreak of rhinopharyngitis took place on an irrigated coconut farm; 7 out of 60 adult sheep were affected. Another outbreak affected a sheep in a flock of 80 during the dry season. Clinical signs as noisy respiration and dyspnoea due to mechanical blockage of the nasal cavities, swelling of the nostrils, and serosanguineous nasal discharge were observed. Six out of 8 sheep in this group showed exophthalmia, keratitis and unilateral corneal ulceration of the eye. The sheep either died of their infection or were euthanized after a clinical course of 7-30 days. At necropsy there was a dense yellow exudate in the nasopharyngeal area affecting the ethmoidal region, turbinate bones, paranasal sinuses, hard and soft palates, orbital cavity, pharynges, regional muscles and lymph nodes. Histopathologically both forms of the disease showed multifocal granulomas with an eosinophilic necrotic reaction (Splendore-Hoeppli phenomenon) containing ribbon-type coenocytic hyphae with 7-30mum in diameter similar to hyphae of zygomycetous fungi, possibly Conidiobolus spp. Outbreaks of both forms of mycotic rhinitis are common in northeastern Brazil and in other regions of the country. Dois surtos de lesões rinofaciais e dois de lesões rinofaríngeas causadas por fungos com hifas filamentosas, raramente septadas, semelhantes às dos fungos entomophthorales, são descritos no Estado da Paraíba. Um surto da forma rinofacial afetou 5 ovinos durante a estação chuvosa. Outro surto desta forma clínica afetou um ovino de um grupo de 40, durante a época seca. Os sinais clínicos da forma rinofacial foram de corrimento serosanguinolento bilateral, com aumento de volume das narinas, lábio superior, e pele da face. Na necropsia, a mucosa nasal apresentava áreas ulceradas de cor marrom escuro, que se estendiam desde a região muco-cutánea até 10cm dentro do vestíbulo nasal. A mucosa do palato duro estava, também, ulcerada. A superfície de corte das narinas e palato apresentava-se marrom ou avermelhada de aspecto esponjoso e friável. Um surto de rinofaringite micótica ocorreu em uma plantação de coco irrigado, afetando 7 ovinos de um rebanho de 60 ovinos adultos. Outro surto desta forma da enfermidade afetou um único animal de um rebanho de 80, durante a época seca. Os animais apresentavam dispnéia, com respiração ruidosa devida ao bloqueio parcial das narinas, e corrimento nasal serosanguinolento. Seis dos oito animais afetados por esta forma da enfermidade apresentaram, em um olho, exoftalmia, ceratite e ulceração da córnea. Todos os ovinos morreram ou foram sacrificados após um curso clínico de 7-30 dias. Na necropsia exsudato amarelo consistente foi observado na região etmoidal, ossos turbinados, seios paranasais, palatos duro e mole, órbita, faringe, e músculos e linfonodos regionais. No estudo histológico, ambas as formas da doença mostraram granulomas multifocais com áreas necróticas eosinofílicas (material de Splendore-Hoeppli) contendo hifas com 7-30mim de diâmetro, raramente septadas, semelhantes às dos fungos entomophthorales, possivelmente Conidiobolus spp. Surtos de ambas as formas de rinite micótica são freqüentes na região semi-árida e em outras regiões do Brasil

Outbreaks of rhinofacial and rhinopharyngeal zygomycosis in sheep in Paraíba, northeastern Brazil