How deadly is west nile virus untreated?

Only 1% have severe: sx. Most people don’t have sx’s w West Nile virus. Mild sx’s occur in about 20% of people; which can include fever, eye pain, generalized body aches, headaches, feeling really tired, & possible enlarged lymph nodes or rash. About 1% have severe illness which can include neurologic problems. Possible sx’s include: seizures, severe headache w stiffness of neck, high fever, confusion & weakness.

West Nile virus: West Nile virus has approximately a 5% mortality rate for the disease. If the disease becomes neuroinvasive and causes meningitis, encephalitis, or acute flaccid paralysis, the mortality rate climbs to around 9%.

3-15% : Per CDC 3-15% case fatality rate, higher in elderly. Less than 1% of people develop symptoms severe enough to be diagnosed.