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Sequential pathological studies in Asian water buffaloes infected intratracheally with Absidia corymbifera.

Zygomycosis was produced experimentally in Asian water buffalo calves (Bubalus bubalis) by intratracheal inoculation of sporangiospores of Absidia corymbifera. Infected animals exhibited dullness, depression, partial anorexia, initial pyrexia, mucopurulent nasal and ocular discharge and coughing during the first week. There was no mortality at any stage of the experiment, which continued for 30 days. The gross and microscopic lesions were restricted to the lungs and there was no dissemination of the fungus to other organs. Gross and microscopic changes in the lungs were observed up to the 20th day post-infection. Gross lesions consisted of pneumonic consolidation of the antero-ventral lobes of the lungs. Microscopic changes consisted of granulomatous reactions with well developed pulmonary granulomas. Distorted hyphae of A. corymbifera were demonstrated in tissue sections up to 15 days post inoculation. Re-isolation of the fungus was achieved consistently for up to 15 days. It is concluded that intratracheal inoculation of A. corymbifera in buffalo calves leads to significant pathological changes in the lungs, but the disease appears to be self limiting 20 days following inoculation.