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West Nile Virus

Fatal Encephalitis and Myocarditis in Young Domestic Geese (Anser anser domesticus) Caused by West Nile Virus

David E. Swayne,* Joan R. Beck,* Calandra S. Smith,† Wun-Ju Shieh,† and Sharif R. Zaki†
*U.S. Department of Agriculture, Agricultural Research Service, Southeast Poultry Research Laboratory, Athens, Georgia, USA; †Centers for Disease Control and Prevention, Atlanta, Georgia, USA

Figure. Two-week-old goslings that were subcutaneously inoculated with 9/99 New York strain of WN virus. (A) Abnormal posture of the head 10 days postinoculation (PI) (#80). The gosling had rhythmic side-to-side movement of the head. Bar = 2.5 cm. (B) Severe nonsuppurative encephalitis at 10 days PI (#80). HE stain. Bar = 50 µm. (C) Severe diffuse myocarditis with edema and myocyte necrosis at 6 days PI (#86). HE stain. Bar = 50 µm. (D) Flaviviral antigens in degenerating myocytes and macrophages within a focus of inflamed myocardium. Immunohistochemical (IHC) strain. Bar = 25 µm. (E) Flaviviral antigens in degenerating parenchymal epithelial cells and foamy macrophages within a focus of pancreatitis. IHC. Bar = 25 µm. (F) Flaviviral antigens in ganglion cells within muscularis mucosae. IHC. Bar = 25 µm.

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Figure. Two-week-old goslings that were subcutaneously inoculated with 9/99 New York strain of WN virus. (A) Abnormal posture of the head 10 days postinoculation (PI) (#80). The gosling had rhythmic side-to-side movement of the head. Bar = 2.5 cm. (B) Severe nonsuppurative encephalitis at 10 days PI (#80). HE stain. Bar = 50 µm. (C) Severe diffuse myocarditis with edema and myocyte necrosis at 6 days PI (#86). HE stain. Bar = 50 µm. (D) Flaviviral antigens in degenerating myocytes and macrophages within a focus of inflamed myocardium. Immunohistochemical (IHC) strain. Bar = 25 µm. (E) Flaviviral antigens in degenerating parenchymal epithelial cells and foamy macrophages within a focus of pancreatitis. IHC. Bar = 25 µm. (F) Flaviviral antigens in ganglion cells within muscularis mucosae. IHC. Bar = 25 µm.
 


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Emerging Infectious Diseases Journal
National Center for Infectious Diseases
Centers for Disease Control and Prevention