There are more cases of West Nile virus in Madison County. Last month, a mosquito batch collected in Mitchell came back positive for the virus. More mosquitoes carrying the virus have been found in Bethalto, Edwardsville, Glen Carbon and Meadowbrook. Symptoms include fever, nausea, headache and muscle aches. But not everyone who gets the West Nile will know they have it.
Officials say four out of five people infected won't show any symptoms. Madison County Health Department spokesman Mary Cooper says while cases in mosquitoes are running a bit ahead of last year, there haven't been any reported cases in humans in Madison County since 2007.
West Nile is not transmittable between humans - you can only get it if you are bitten by an infected mosquito. Animals can also get West Nile, and is especially dangerous to horses, according to Cooper.