What causes west nile virus?

A mosquito-transmitted virus causes most cases of West Nile infection. Most people infected with West Nile virus either don't develop signs or symptoms or have only minor ones, such as fever and mild headache. However, some people develop a life-threatening illness that includes inflammation of the spinal cord or brain. read more

Learn about the causes and symptoms of the West Nile virus. read more

West Nile virus infection is also sometimes referred to as West Nile fever (WNF) or West Nile encephalitis (WNE). History of West Nile Virus in the U.S. West Nile virus was discovered in 1937 in the West Nile district of Uganda. read more