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West Nile virus
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Diagram showing the West Nile virus transmission cycle: a mosquito bites an infected bird (the primary reservoir host), then transmits the virus to humans or horses (incidental hosts) through subsequent bites. West Nile virus
Diagram showing a microscope with a magnified view of a large, rod-shaped bacterium next to a much smaller, round virus particle.
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West Nile virus: Media

viral disease
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What's the Difference Between Bacteria and Viruses?
Knowing the difference isn't just a technical distinction—it can save lives.
Video: Encyclopædia Britannica, Inc.

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West Nile virus
Birds are the primary reservoirs of West Nile virus. The virus is transmitted to...
Encyclopædia Britannica, Inc.
West Nile virus
Colourized transmission electron micrograph (TEM) of West Nile virus.
P.E. Rollin, Centers for Disease Control and Prevention; photograph, Cynthia Goldsmith
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