What is West Nile Virus?

West Nile virus (WNV) is a potentially serious virus that is transmitted by mosquitoes that affect the nervous system. According to the Centers for Disease Control and Prevention (CDC), it is established as a seasonal epidemic in North America, and the season typically stretches through summer and into fall.

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1. What is West Nile Virus?
2. How is it spread?
3. Can it be treated?
4. What is the risk of getting very sick from West Nile Virus?
5. Can animals be infected?