What is West Nile virus?

West Nile Virus is an arbovirus (arthropod-borne virus) transmitted primarily through the bite of infected mosquitoes. West Nile virus was first identified in the United States in 1999. The virus can infect humans, birds, mosquitoes, horses, and some other mammals.

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1. What is West Nile virus?
2. How is West Nile virus spread?
3. What are the symptoms?
4. Where can I find information on the spread of the disease in Washington State and in the United States?