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Abstract
Hematological findings in a female killer whale (Orcinus orca) undergoing rehabilitation after sudden severe anorexia revealed continuing increases in serum lactate dehydrogenase and aspartate aminotransferase activities as well as fibrinogen concentration. Serologic evidence of herpesvirus infection and skin vesicles were detected 2 weeks into the treatment regimen of antibiotics and corticosteroids. The whale showed signs of improvement after treatment with anti-herpesvirus drugs, but sudden severe anorexia reappeared, along with marked elevation of fibrinogen concentration that continued until the death. Postmortem examination revealed multiple light tan foci of necrosis in the skeletal and cardiac muscles, and lung consolidation. Microscopic findings indicated disseminated fungal granulomas in the skeletal and cardiac muscles, as well as myocarditis, mycotic embolic thromboarteritis of cardiac blood vessels, and bronchopneumonia with numerous typical Aspergillus-like fungi. Mucor-like structures in granulomas in the heart and skeletal muscle and Aspergillus-like fungi in the lungs were identified using periodic acid-Schiff, Gomori methenamine silver stain, and immunohistochemistry. The present case involves dual infection with Mucor and Aspergillus species in a killer whale with concurrent herpesvirus.
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