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Classification of West Nile Virus
images are of West Nile virus isolated from brain tissue from
a crow found in New York. The tissue was cultured in a Vero
cell for a 3-day incubation period. The Vero cells were fixed
in glutaraldehyde, dehyrated, placed in an Epon resin, thin
sectioned, placed on a copper grid, and stained with uranyl
acetate and lead citrate. The grids were then placed in the
electron microscope and viewed. Total magnifications, image
image B: 171,250x.
courtesy of Bruce Cropp, Microbiologist, Division of Vector-Borne
Flavivirus Japanese Encephalitis Antigenic Complex
includes: Alfuy, Cacipacore, Japanese encephalitis, Koutango,
Kunjin, Murray Valley encephalitis, St. Louis encephalitis,
Rocio, Stratford, Usutu, West Nile, and Yaounde viruses.
share a common size (40-60nm), symmetry (enveloped, icosahedral
nucleocapsid), nucleic acid (positive-sense, single stranded
RNA approximately 10,000-11,000 bases), and appearance in the
electron microscope. Therefore, images of West Nile virus are
representative for this group of viruses.