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According to Sciencedaily, a new study conducted by researchers at the University of Calgary and international collaborators has revealed that chronic wasting disease (CWD) may be significantly more unpredictable than previously understood. The research focuses on how infectious prions—the proteins responsible for the fatal neurological condition—can move between species without triggering immediate clinical signs in the host animals.
Silent transmission and prion behavior
The study, published in Science Advances, utilized controlled laboratory experiments to examine the zoonotic potential of CWD. Investigators observed that many animals involved in the study did not develop any visible symptoms of the disease. Despite this lack of clinical evidence, researchers detected small amounts of infectious prions within their tissues. When these samples were subsequently transferred to other species, those recipients began to exhibit clear signs of CWD.
"These findings show that even without obvious (clinical signs), infectious prions can still be present and transmissible," — Dr. Samia Hannaoui, PhD, researcher and assistant professor at the University of Calgary Faculty of Veterinary Medicine (UCVM).
Challenges in disease management
Prion diseases are notoriously difficult to forecast because the proteins involved can change as they move between different hosts. This evolutionary capacity means that a single agent can produce various strains with distinct characteristics over time. The researchers identified several factors that make CWD particularly difficult to manage:
Implications for public health and wildlife
While the study does not indicate an immediate threat to human health, it highlights a nuanced reality regarding prion behavior. Experts note that while a strong barrier currently exists between CWD and humans, historical precedents like bovine spongiform encephalopathy (BSE) show that species barriers can be breached. "Our findings don't indicate an immediate risk to humans, but they do suggest the situation is more nuanced than previously understood," — Dr. Hermann Schaetzl, MD, Dr. med, UCVM professor and last author on the study.
As CWD continues to expand into new regions of North America, including parts of Alberta, these findings emphasize the necessity of continued monitoring. Understanding how prions adapt and spread silently is essential for developing effective long-term containment strategies for wildlife populations.