Chronic wasting disease of cervids: current knowledge and future perspectives

Area of Science:

• Veterinary Neurology
• Prion Disease Research
• Wildlife Epidemiology

Background:

• Chronic Wasting Disease (CWD) is a naturally occurring transmissible spongiform encephalopathy (TSE) affecting cervids.
• First identified in 1967, CWD has expanded its geographic range and host species.
• The disease is caused by misfolded prion proteins, leading to progressive, fatal neurological degeneration.

Purpose of the Study:

• To summarize the current understanding of Chronic Wasting Disease (CWD) in cervids.
• To highlight the transmission routes, detection challenges, and management strategies for CWD.
• To underscore CWD's significance as a unique challenge in prion disease research.

Main Methods:

• Review of existing literature on CWD epidemiology and pathogenesis.
• Analysis of CWD transmission dynamics, including horizontal spread and environmental contamination.
• Examination of advancements in CWD detection methods and potential diagnostic tools.

Main Results:

• CWD has spread to 22 US states, 2 Canadian provinces, and South Korea, affecting various cervid species.
• Horizontal transmission via excreta and contaminated environments is a key feature of CWD.
• Evolving detection methods have identified multiple CWD strains, with ongoing efforts toward an antemortem test.

Conclusions:

• CWD poses a significant and expanding threat to cervid populations.
• Effective management strategies, including potential vaccines and environmental remediation, are crucial.
• Continued research into CWD pathogenesis and control is essential for addressing this prion disease challenge.