What Are the Symptoms of West Nile Virus
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.

Show All Answers

1. What are West Nile virus, West Nile fever, and West Nile encephalitis?
2. What Are the Symptoms of West Nile Virus
3. How is West Nile Spread?
4. 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?
5. What can I do to help prevent the spread?
6. Following the 'four Ds' can help beat mosquito bites
7. Is West Nile Virus contagious?
8. What is the treatment for West Nile Virus?