West Nile virus shows up in Central Illinois for the first time this year. Champaign Urbana Public Health officials collected a crow on June 12th, which tested positive for the virus. Officials expect to see an increase in West Nile activity this year because mosquitoes are more likely to bite when the weather is hot. Humans infected with the virus may experience fever, nausea, headache and muscle aches. Symptoms may last from a few days to a few weeks. In rare cases, severe illness including meningitis, encephalitis, or even death, can occur. You can reduce your exposure to the virus by wearing insect repellent to ward off mosquitoes.