Abstract
The present paper reports a case of pulmonary mucormycosis in a 19 wk layer bird that was presented for necropsy to the Department of Veterinary Pathology, NTR College of Veterinary Science, Gannavaram. Mycotic pneumonia in poultry is commonly due to Aspergillus spp and due to others like Mucor spp is very rare. On postmortem examination, the lungs were enlarged, consolidated with multiple greyish white nodules. Histologically, the lung sections revealed pyogranulomatous lesions with branched aseptate hyphae in center of necrosed area that was surrounded by heterophils, macrophages, lymphocytes and multi nucleated giant cells. These fungal hyphae were broad and a few showing right angle and/or irregular branching characteristic of Zygomyces spp. with periodic acid Schiffs reagent
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