Chronic Wasting Disease (CWD) was first documented in Illinois in November 2002; by June 2008, the total number of reported cases of CWD in Illinois was 227. The spread of disease from 5 counties in 2002-2003 (Boone, DeKalb, McHenry, Ogle and Winnebago) to include (LaSalle and Stephenson by 2008), continues to raise concerns associated with the spread of disease within and across state borders.
CWD continues to be identified in the northern counties of the state of Illinois.
Current scientific knowledge related to CWD transmission, spread, infectious dose and impact on wildlife populations remains limited. Scientific advances related to CWD are slow and closely related to the chronic nature of the disease, the inability to diagnose it based on clinical signs (diagnosis is post mortem), long incubation period among others.
Therefore, the effectiveness of an intervention strategy requires a long term (years) commitment. The evaluation of the effectiveness of such an intervention can only be assess if the intervention strategy has been persistent and continual (across time and space).
For addtional information on the spatial aspects of CWD see Marilyn Ruiz biosketch, College of Veterinary Medicine.