How long has West Nile virus been in the U.S.?

It is not known how long it has been in the U.S., but Center for Disease Control and prevention (CDC) scientists believe the virus has probably been in the eastern U.S. since the early summer of 1999, possibly longer.

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1. Where did West Nile virus come from?
2. How long has West Nile virus been in the U.S.?
3. I understand West Nile virus was found in "overwintering" mosquitoes. What does this mean?
4. How do people get West Nile encephalitis?
5. If I live in an area where birds or mosquitoes with West Nile virus have been reported and a mosquito bites me, am I likely to get sick?
6. How does West Nile virus actually cause severe illness and death in humans?
7. What proportion of people with severe illness due to West Nile virus die?
8. Is there a vaccine against West Nile encephalitis?
9. Is adulticide an effective means of controlling mosquitos?
10. ¿Se puede tratar el virus del Nilo occidental?
11. ¿Cuál es el riesgo de enfermarse del Virus del Nilo Occidental?
12. ¿Pueden infectarse los animales con el virus del Nilo Occidental?
13. ¿Todos los mosquitos portan el Virus del Nilo Occidental?