The Joe Rogan ExperienceJoe Rogan Experience #1154 - Doug Duren & Bryan Richards
CHAPTERS
- 0:02 – 3:21
CWD arrives on Doug’s Wisconsin farm and why it worries hunters
Joe introduces Doug Duren and wildlife biologist Bryan Richards, framing the episode around chronic wasting disease (CWD) and its arrival on Doug’s property in Wisconsin. They set up the controversy around downplaying CWD and why the topic matters beyond ordinary deer mortality.
- •CWD has been detected on Doug’s farm in Wisconsin
- •Concern that high-fence/captive deer operations can amplify and spread disease
- •Why the discussion matters to hunters, conservation, and potentially humans
- •Setting the stage for a science-based breakdown of CWD
- 3:21 – 4:20
What CWD does to deer: a fatal prion brain disease
Bryan defines CWD as a transmissible spongiform encephalopathy (TSE) that causes progressive neurological damage and death. They clarify that there is no cure and relate it to other TSEs familiar to the public.
- •CWD creates spongiform damage (“holes”) in the brain
- •Progressive neurological decline ends in death (effectively 100% fatal)
- •No treatment or cure once infected
- •Connection to human TSEs like Creutzfeldt–Jakob disease
- 4:20 – 5:36
Prions ("preons"): what they are and why they persist
The conversation drills into what prions are (misfolded proteins) and why they’re uniquely hard to neutralize. Bryan explains how normal prion proteins differ from disease-associated forms, including extreme resistance and long environmental persistence.
- •Prions are proteins, not living organisms with DNA
- •Disease-associated prions resist heat/UV and are difficult to inactivate
- •Normal prion proteins are short-lived; misfolded forms persist for years/decades
- •Environmental persistence makes management far harder than typical pathogens
- 5:36 – 10:53
How TSEs spread in people and livestock: kuru and mad cow lessons
Using kuru in Papua New Guinea and BSE (mad cow disease), Bryan explains how feeding infected nervous tissue drives transmission. These examples illustrate long incubation periods and how breaking the transmission cycle can end outbreaks—unlike CWD.
- •Kuru spread through ritual cannibalism; incubation could last decades
- •BSE emerged from feeding rendered cattle material back to cattle
- •Transmission cycles can be stopped when the exposure route is removed
- •Prions concentrate in brain and certain internal tissues
- 10:53 – 13:11
CWD’s stealth phase: incubation, shedding, and “Typhoid Mary” deer
They explain why CWD is so difficult to control: infected deer can look healthy for a long time while shedding infectious material. Doug’s experience testing apparently healthy bucks underscores how infection can be invisible in the field.
- •Incubation often ~2 years before obvious symptoms
- •Deer can shed prions (saliva/urine/feces) while appearing healthy
- •Testing can miss early infections; positives emerge later
- •Doug’s first positives were healthy-looking 2.5-year-old bucks
- 13:11 – 14:42
From localized to global: spread across states and into Norway
Bryan traces CWD’s expansion from a small western U.S. focus to widespread presence across North America and beyond. He details detections in many U.S. states, Canada, South Korea (via imported captive elk), and Scandinavia.
- •CWD expanded from WY/CO to broad multi-state distribution
- •Now detected in many U.S. states and Canadian provinces
- •South Korea cases traced to imported captive elk
- •Recent detections in Norway/Finland raise major concerns for reindeer
- 14:42 – 19:41
Norway’s hard-line response: stamping out an entire reindeer herd unit
Norway’s approach is presented as a rare example of aggressive early intervention: eliminating an entire herd unit and keeping the area fallow. They discuss why early detection and fast action are critical given environmental contamination.
- •Norway killed ~2,400 reindeer to eliminate the host population
- •Plan includes keeping the area reindeer-free for at least 5 years
- •Low initial prevalence suggested the outbreak was newly introduced
- •Early, aggressive response may be the best chance for success
- 19:41 – 21:43
Human health risk and the species barrier—plus the problem of CWD strains
They address whether CWD can infect humans, emphasizing that epidemiology hasn’t shown crossover but science can’t rule it out. The discussion deepens into “species barrier” mechanics and why evolving strains could change the risk profile.
- •No epidemiological signal yet of increased human prion disease where CWD is present
- •Experimental models suggest a small, non-zero risk
- •Species barrier may be less robust than assumed and could change over time
- •Multiple CWD strains exist; strain differences can alter host susceptibility
- 21:43 – 36:23
Why dismissing CWD is misleading: comparing it to EHD and winter kill
Responding to claims that other factors kill more deer, Bryan contrasts CWD with EHD (a midge-borne disease) and seasonal mortality. The key distinction is that CWD’s transmission cycle has no known natural “off switch” and prevalence can climb indefinitely.
- •EHD outbreaks can be severe but end when frost stops the vector
- •CWD has no known ecological endpoint to transmission
- •Prevalence can rise dramatically (e.g., ~80% in some captive herds)
- •Diversion and cherry-picking are common tactics in public debate
- 36:23 – 54:17
Environmental contamination and agriculture: plants, hay bales, and exposure vs infection
Bryan explains how prions can bind to surfaces, be taken up by plants, and potentially move via agricultural practices. They stress the difference between widespread exposure and proven transmission to humans or livestock, while noting exposure is increasing.
- •Prions can bind chemically to plants and be taken up via roots in experiments
- •Infected deer contaminate fields via saliva/urine/feces
- •Potential (unproven) pathways via hay bales and commodity transport
- •Clear exposure is rising; cross-species transmission remains uncertain
- 54:17 – 1:17:20
What can be done now: disposal, carcass movement, regulations, and deer farms
Doug and Bryan shift to actionable steps: slowing spread, improving disposal infrastructure, and reducing human-assisted movement. They discuss clay-lined landfill disposal, testing kiosks, and how captive cervid facilities and carcass dumping can move CWD long distances.
- •“Buy time and pay for science” as a practical strategy
- •Carcass movement and improper disposal can spread infection geographically
- •Clay liners can immobilize prions in landfills; logistics and liability limit adoption
- •Captive deer/elk facilities have contributed to spread, but are not the only factor
- 1:17:20 – 2:17:02
Long-term tools and tradeoffs: vaccines, genetic resistance, predators, and hunting policy battles
They explore future possibilities (vaccines, genetic resistance) and why partial solutions can have unintended consequences. The episode closes on contentious management choices—buck-focused harvest, baiting/feeding bans, Earn-A-Buck politics—and the need for education and political will.
- •Vaccine research exists but remains difficult; one trial even worsened outcomes
- •Genetic “resistance” can extend incubation, potentially increasing shedding time
- •Predators may remove weakened deer but won’t eliminate environmental contamination
- •Hunting regulations (buck harvest focus, Earn-A-Buck) are politically polarizing
- •Education and pressure on legislators are essential for science-based management
