West Nile Virus

Howdy.
I'm West Nile Virus.
I'm a flavivirus.
I'm also an arborvirus.

I live in Africa, the Middle East, Europe and now in North America.
I live in crows and other wilds birds.
Then mosquitoes carry me.

Mostly I just give you fever and pain all over.
Sometimes I get into your brain.
I give you a rash.