Wild Deer and Chronic Wasting Disease

Chronic wasting disease — a fatal prion disease of deer, elk, and moose — causes prolonged neurological deterioration in affected animals and raises welfare questions about population management responses.

Key Facts

Chronic wasting disease has spread to 32 US states, 4 Canadian provinces, Norway, Finland, and Sweden
Affected deer develop progressive weight loss, coordination loss, drooling, and behavioral changes before death
The incubation period is 1 to 3 years, during which animals are infectious but show no symptoms
There is no cure or vaccine — management focuses on reducing deer density and limiting transmission
Hunting carcass movement restrictions limit geographic spread but require hunter compliance
The disease is invariably fatal — affected individuals experience prolonged decline over months

Welfare Considerations

Chronic wasting disease causes one of the most prolonged welfare declines documented in wild cervid populations. Affected deer experience progressive neurological deterioration over months — losing weight, coordination, and eventually basic function before death. The welfare case for population management that reduces transmission is strong: preventing the spread of a disease causing prolonged, invariably fatal suffering is a welfare benefit even when management measures involve lethal control. The welfare of individual deer dying from CWD, and of populations facing endemic transmission, justifies active management interventions that reduce prevalence.

What You Can Do

Follow all carcass movement restrictions when hunting in CWD-affected areas
Support CWD surveillance programs that track disease spread
Advocate for science-based deer population management that reduces CWD transmission risk
Do not feed deer in areas with CWD — concentration increases transmission
Donate to research programs working on CWD detection, prevention, and potential treatments