What virus, spread by the mosquito, causes a typically self-limiting illness, but can be associated with a rash, aseptic meningitis, myelitis, and fatal encephalitis?

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West Nile virus (WNV) is a mosquito-borne flavivirus that commonly causes a self-limited febrile illness, often associated with a rash.In 1999 the virus was introduced in the United States; it has since spread rapidly.Neurologic involvement includes aseptic meningitis, myelitis, and fatal encephalitis.The mortality rate is about 5%, and death occurs mainly in older patients.

What Virus, Spread by the Mosquito, Causes a Typically Self-Limiting