What Are the Symptoms of West Nile Virus?
Most people who are infected with the West Nile virus (80%, or four out of five people) will have minimal or no symptoms. It is estimated that 20% of the people who become infected will develop West Nile fever with mild symptoms, including fever, headache, and body aches, occasionally with a skin rash on the trunk of the body and swollen lymph glands.
The symptoms of severe infection (West Nile encephalitis or meningitis) include headache, high fever, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, and paralysis. It is estimated that one in 150 people infected with the West Nile virus will develop a more severe form of disease.