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West Nile Virus (WNV) is a potentially serious - illness. Although WNV is seasonal in the L `" Mainland, if it arrives in Hawaii it is expected to Y' + occur year round as we are not affected by sea- sons. What Are the Symptoms of West Nile Virus (WNV)? WNV affects the central nervous system. Symptoms vary. • No Symptoms in Most People.About 80% of people infected with WNV will not show any symptoms and will not be affected Culex mosquito larva. at all. • Mild Symptoms in Some People. Less than 20% of people infected will display mild symptoms, including fever, headache, and body aches, nausea, vomiting, and sometimes swollen lymph glands or a skin rash on the chest, stomach and back. Symptoms typically last a few days. • Severe Symptoms in a Few People. Less than one percent of people infected with WNV will develop severe illness.The severe symptoms can include high fever, headache, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, vision loss, numbness and paralysis. These symptoms may last several weeks, and may lead to permanent damage or even death. How Soon Do Infected People Get Sick? People typically develop symptoms between 3 and 14 days after they are bitten by an infected mos- quito. What Should I Do if I Think I Have West Nile Virus (WNV)? Mild WNV illness improves on its own, and people do not necessarily need to seek med- ical attention for this infection. If you develop symptoms of severe WNV illness, such as unusually severe headaches or confusion, seek medical attention immediately. Severe WNV illness usually requires hospitalization.