INVASIVE PULMONARY PSEUDALLESHERIOSIS IN A CROSS-BREED CALF

Pulmonary pseudallescheriosis was diagnosed in a two-months old calf. Pneumonic lungs with yellow-white nodules on the surfaces revealed gra nulomatous lesions microscopically. Septate, pleomorphic hyphae were p resent in the central caseated core with a bright eosinophilic periphe ry surrounded by polymorphonuclear cells and macrophages followed by a zone of epithelioid cells admired with lymphocytes and plasma cells. The fungal agent was demonstrated by Grocott's silver methenamine stai ning. On isolation, morphologically it was found to be indistinguishab le from that of Pseudallescheria boydii. It appears to be first report of fatal mycotic pneumonia in a calf due to P. boydii. The emphasis i s given for further detailed investigation on this aspect in veterinar y mycopathology.