The Moultrie County Health Department (MCHD) has recently been notified by the Illinois Department of Public Health (IDPH) that a bird specimen submitted from Moultrie County has tested positive for West Nile virus (WNV). The specimen was collected in the Kirksville area on September 29, 2021. Once a bird, animal or human in any county has tested positive for WNV, the entire county is considered positive for WNV. WNV is the leading cause of mosquito-borne disease in the continental United States, and is most active from mid-April through October.