Zygomycosis in the duck.

The fungal disease zygomycosis was diagnosed in the thoracic cavity of two 7-weeks-old ducks. In the first case, the diagnosis was based on examination of granulomas that were found to contain fungal hyphae characteristics of zygomycetes. The second case was diagnosed using similar criteria along with the subsequent culture of Mucor sp. from the lesion. To attain a definitive diagnosis of zygomycosis, the fungal hyphae found during histologic examination must be differentiated from Aspergillus sp. and Dactylaria gallopava.