Severe illness can occur in people of any age however, people over 60 years of age are at greater risk for severe illness if they are infected (1 in 50 people).Symptoms of severe illness include high fever, headache, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, vision loss, numbness and paralysis.Serious symptoms in a few people. About 1 in 150 people who are infected develop a severe illness affecting the central nervous system such as encephalitis (inflammation of the brain) or meningitis (inflammation of the membranes that surround the brain and spinal cord).
Most people with febrile illness due to West Nile virus recover completely, but fatigue and weakness can last for weeks or months. About 1 in 5 people who are infected develop a fever with other symptoms such as headache, body aches, joint pains, vomiting, diarrhea, or rash. Most people (8 out of 10) infected with West Nile virus do not develop any symptoms.įebrile illness (fever) in some people.
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