Joe Rogan Experience #1154 - Doug Duren & Bryan Richards

Episode Summary

Main Topics Discussed

• The devastating impact and spread of Chronic Wasting Disease (CWD) among deer populations in North America and internationally.
• The nature of CWD as a Transmissible Spongiform Encephalopathy (TSE), caused by highly resilient prions, and its similarities to Mad Cow Disease (BSE) and Creutzfeldt-Jakob disease in humans.
• The critical concern regarding the potential for CWD to jump the species barrier to humans, despite no confirmed cases yet.
• Distinction between CWD's persistent transmission cycle and diseases like Epizootic Hemorrhagic Disease (EHD), which have natural ecological breaks.
• Challenges in CWD management, including the long incubation period during which animals are infectious but appear healthy, and the public's reluctance to accept drastic measures.
• Norway's radical approach to CWD management, involving the culling of an entire reindeer herd to halt its spread.
• The concept of prion strains and how CWD may be evolving, potentially impacting its transmissibility to other species.

Key Insights & Memorable Moments

• CWD is caused by prions, which are not alive but are misfolded proteins that are incredibly resistant to heat, UV light, and can persist in the environment (soil, plants) for years, even decades.
• Deer can be "Typhoid Marys," shedding infectious prions for up to two years before showing clinical signs, making disease control extremely difficult.
• Unlike many other diseases, CWD has no known ecological factor to stop its transmission cycle, leading to relentlessly increasing prevalence in affected herds, reaching up to 80% in some captive facilities.
• The historical context of Kuru (a human TSE spread via ritualistic cannibalism where women and children ate prion-rich brains) and Mad Cow Disease (spread by feeding rendered cows back to cows) serves as a stark warning about prion disease transmissibility.
• Recent scientific findings suggest that the species barrier between CWD and humans might not be as robust as previously thought, with the discovery of a wild CWD strain that can infect laboratory mice (whose prion structure resembles humans).
• Norway's controversial decision to cull 2,400 reindeer in an infected herd unit and keep the land fallow for five years is presented as a potentially successful, albeit drastic, model for early disease eradication.

Notable Quotes or Revelations

• Bryan Richards on human risk: "

  We cannot rule out the possibility that CWD could become a human health issue at some point down the road.

  "
• On the nature of prions: "

  they're not alive... they can persist, they cannot be inactivated.

  "
• Describing the asymptomatic spread: "

  it's probably shedding infectious agent for the vast majority of that time period. So it looks healthy but it's able of transmitting disease. We'd call that a typhoid Mary syndrome.

  "
• On the relentless progression of CWD: "

  with CWD there's no known ecological factor which signals the end of the transmission cycle. So that's why we see prevalence... it just keeps going up up up.

  "
• Regarding the evolving threat of prion strains: "

  all the assumptions that people can't get CWD are based that on this idea that CWD is CWD and it will always be exactly the same thing but our experience with scrapey strongly suggests that even though there's no there's no DNA in these things that they do change over time they morph over time into slightly different disease characteristics and etiologic agents.

  "

Overall Themes

• The Insidious Nature of Prion Diseases: The episode thoroughly explores how prions, as non-living infectious agents with extreme resistance and long incubation periods, pose a unique and persistent threat that challenges traditional disease management.
• A Looming Interspecies Threat: A central theme is the serious, albeit unconfirmed, risk of CWD bridging the species barrier to humans, highlighting the ethical and public health dilemmas surrounding consumption of infected meat and the need for caution.
• Ecological Vulnerability and Irreversibility: The discussion underscores the fragility of wildlife populations to diseases like CWD that lack natural brakes, suggesting an irreversible trajectory of spread and increasing prevalence in affected ecosystems.
• The Paradox of Public Perception vs. Scientific Urgency: The conversation reveals a stark contrast between the scientific understanding of CWD's severity and the public's (and some hunters') tendency to downplay or deny the threat due to inconvenience or skepticism, complicating effective intervention.
• Radical Solutions for Persistent Problems: Norway's aggressive culling strategy serves as a case study for the extreme measures potentially required to combat a disease with no cure and no natural end to its transmission cycle, contrasting sharply with less decisive approaches.