Mosquitoes collected in McLean County tested positive for West Nile virus, the first positive evidence of the virus in the county, according to a release Monday. McLean County is one of 22 counties across the state to have a mosquito collection test positive for West Nile this year. Seven birds have tested positive so far this year. West Nile primarily occurs in midsummer to early fall, although mosquitoes can carry the disease from mid April through October. West Nile is a mosquito borne disease that can cause encephalitis, an inflammation of the brain.
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