http://www.health.alberta.ca/public/wnv_faq.html#reduce
What effect does West Nile virus have on people?
* While most people who become infected with West Nile virus will experience no symptoms, one in five will develop West Nile Non-Neurological syndrome (formerly known as West Nile fever). Symptoms can include fever, severe headache, body aches and possibly a rash. Very few individuals will experience the more severe symptoms of West Nile Neurological Syndrome.
* The neurological syndrome can include high fever, worsening headache and neck stiffness, stupor and disorientation, coma and tremors, occasional convulsions, paralysis, muscle weakness and numbness or difficulty moving. Long-term neurological effects have occurred in about 50 per cent of cases of West Nile Neurological Syndrome. In very rare cases, a West Nile virus infection can be fatal.
It was a bad last year in Alberta, and with the recent moisture, it maybe just as bad if not worse this year. Most people will be symptom free if they get exposed, but on rare cases, it'll develop into neurological case, and that's not so good. Young Children and the elderly are especially at risk. Cover up and use DEET this summer, especially in the deep South. Palliser and David Thompson were the worse regions for identified West Nile Mosquitoes last year.