What are the symptoms of West Nile virus disease?
No symptoms in most people. Most people (70-80%) who become infected with West Nile virus do not develop any symptoms.

Febrile illness in some people. About 1 in 5 people who are infected will develop a fever with other symptoms such as headache, body aches, joint pains, vomiting, diarrhea, or rash. Most people with this type of West Nile virus disease recover completely, but fatigue and weakness can last for weeks or months.

Severe symptoms in a few people. Less than 1% of people who are infected will develop a serious neurologic illness such as encephalitis or meningitis (inflammation of the brain or surrounding tissues). The symptoms of neurologic illness can include headache, high fever, neck stiffness, disorientation, coma, tremors, seizures, or paralysis.

Recovery from severe disease may take several weeks or months. Some of the neurologic effects may be permanent. About 10 percent of people who develop neurologic infection due to West Nile virus will die

Show All Answers

1. What is West Nile virus?
2. How do people get West Nile virus?
3. How soon do people get sick after getting bitten by an infected mosquito?
4. What are the symptoms of West Nile virus disease?
5. How can people reduce the chance of getting infected?
6. What repellent should I use?
7. How do birds get infected with West Nile virus?
8. Do birds infected with West Nile virus die or become ill?
9. What should I do if I find a dead bird?
10. Where can I report a problem with mosquitoes?