| Summary: | A Whooper Swan which usually migrates from Siberia to the north ofJapan in the winter season was found in Kume Island at the south of Japan in astate of pronounced illness. Blood and serum analysis revealedhypoalbuminaemia elevated serum level of uric acid (UA) and creatininphosphokinase (CPK). The bird succumbed after unsuccessful attempts fortreatment. At necropsy, the bird had multiple focal and coalescent caseatedgranulomatous nodules of whitish greenish color on the thoracic and abdominalair sacs, the lungs, and the serosal surfaces of the spleen, liver and kidneys. Atthe inner side of the air sacs hyphal growth with dark greenish color werescattered on most of the surface. Histopathologically, the present case had asever degree of chronic disseminated aspergillosis. The granulomas had a centralnecrotic areas consisted of necrotic cell debris and hyphae with themicroscopical features of Aspergillus. A. fimigatus was identified in tissues byPAS, GMS, and immunohistochemically. PCR was very successful to identifythe causative fungus like other infectious agent.
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