wnv symptoms
West Nile virus (WNV) is an infectious disease that first appeared in the United States in 1999. Infected mosquitoes spread the virus that causes it. People who get WNV usually have no symptoms or mild symptoms. The symptoms include a fever, headache, body aches, skin rash, and swollen lymph glands. They can last a few days to several weeks, and usually go away on their own. If West Nile virus enters the brain, however, it can be life-threatening.
Mild signs and symptoms of a West Nile virus infection generally go away on their own. But severe signs and symptoms â such as a severe headache, fever, disorientation or sudden weakness â require immediate attention. Exposure to mosquitoes where West Nile virus exists increases your risk of getting infected.
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.