If a human gets West Nile Virus, can he be cured?

or will he die.

It is rare that someone dies of West Nile Virus Disease. Usually they will be over 50 if it happens.
I guess it's best to get West Nile when you are younger and get it over with, then you are immune to it. I don't think the CDC see it that way though.
Below is some information from the CDC website.

What Are the Symptoms of WNV?

Serious Symptoms in a Few People. About one in 150 people infected with WNV will develop severe illness. The severe symptoms can include high fever, headache, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, vision loss, numbness and paralysis. These symptoms may last several weeks, and neurological effects may be permanent.
Milder Symptoms in Some People. Up to 20 percent of the people who become infected have symptoms such as fever, headache, and body aches, nausea, vomiting, and sometimes swollen lymph glands or a skin rash on the chest, stomach and back. Symptoms can last for as short as a few days, though even healthy people have become sick for several weeks.
No Symptoms in Most People. Approximately 80 percent of people (about 4 out of 5) who are infected with WNV will not show any symptoms at all.
http://www.cdc.gov/ncidod/dvbid/westnile...

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