Bedbugs, Pig Kidneys and the 1918 Spanish Flu: Naked Scientists Explores Breakthroughs

Episode snapshot

A Naked Scientists episode surveys bedbugs, a groundbreaking pig kidney transplantation study, and new insights into the 1918 influenza pandemic, featuring expert guests and practical science context.

Key insights

• Bedbugs are resilient insects with clear bite patterns and practical prevention tips for travelers and homeowners.
• Scientists edited pig genomes to reduce immune rejection, enabling long-term kidney graft survival in non-human primates and paving the path toward human trials.
• Skeletal evidence from the 1918 flu era suggests health status and stress history influenced mortality risk, challenging oversimplified narratives about which adults were most at risk.
• Policy-relevant discussions surround nitazines as potent legal/illegal alternatives to fentanyl and the role of safe testing spaces and reversal agents in reducing harm.

Bedbugs, biology and prevention

The podcast opens with bedbug expert James Logan laying out what makes bedbugs formidable. Adults are about the size of an apple seed, and these insects can survive up to a year without feeding. They feed on human blood and are drawn to human odor and heat. Logan walks listeners through how bedbugs locate hosts, typically emerging in response to carbon dioxide and body heat after travellers return from holidays. Bite patterns can help distinguish bedbug bites from mosquitoes or fleas, with clusters or linear sequences often forming along exposed skin. The section emphasizes that detection can be difficult and that containment requires professional pest control rather than DIY solutions, given possible insecticide resistance and the challenge of complete eradication.

Preventive measures in travel and home environments

Prevention focuses on hotel hygiene and careful packing. Logan recommends checking reviews for bedbug reports, moving rooms if bites persist, and keeping luggage off floors with racks and zipped compartments. When returning home, unpacking outside the living area is advised since bedbugs struggle to survive in open air. Laundering clothes at 60 degrees Celsius and freezing clothing for a few days are practical steps to eliminate any hitchhikers. The segment also highlights signs such as bites and brown bedbug droppings on sheets, guiding listeners to act quickly to minimize infestations.

Genetic engineering and transplantation: the pig kidney study

The program shifts to a major biotech advance as Harvard geneticist George Church discusses long-term functioning kidney transplants from genetically modified pigs into non-human primates. The edits target three major immunological barriers: hyperacute sugar epitopes, down-regulating human immune reactivity, and removing latent viruses embedded in the pig genome. Church explains that 69 edits were made in total, including inserting human proteins to modulate immune response and deleting problematic viral signatures. The edited pigs remain healthy, and the animals show kidney survival for over two years in primate recipients, with a goal of extending survival beyond one year as a benchmark toward human trials. Church notes that investigations and FDA discussions are anticipated in the near term as part of the clinical trial pathway, signaling a potential shift toward pig-derived organs becoming a practical option for human transplant recipients.

Immunity, safety and translational steps

Listeners hear about intrinsic safety measures, including the removal of retroviruses to lower cancer risk and ongoing evaluation of how pig organs interact with human immune systems. The host asks whether such genetic modifications could introduce new complications in the patient, and Church responds that while risk cannot be eliminated, processes are designed to reduce latent risks and improve compatibility. The discussion addresses interim steps in translational medicine, including compassionate use cases and brain-dead donor scenarios as potential testing avenues before widespread clinical trials.

1918 influenza pandemic: skeleton-based health insights

Salient segments recount a study by Amanda Whistler published in Nature that challenges the notion that only old or unhealthy individuals died in the 1918 pandemic. Whistler uses skeletal remains to infer long-term stress and health trajectories. By examining tibial markers of stress, she illustrates that people with chronic stress were more likely to die from the flu, while healed injuries indicated resilience. The findings suggest that the risk factors for severe influenza in 1918 overlapped with those we observe in contemporary pandemics, including the role of preexisting health status in mortality risk. The discussion clarifies that while overall risk increased during the 1918 outbreak, the simplistic claim that healthy adults were the primary victims does not hold up under scrutiny.

Question of the Week: wells and water history

Rhys James introduces a historical inquiry about how people in the past found wells. Environmental historian Ellen Arnold explains that people used natural indicators such as animal behavior, plant distribution, and hydrological cues to locate reliable groundwater. The piece emphasizes a collaborative, multi-generational approach to water infrastructure, combining observational clues with proto-engineering know-how and collective knowledge to reach groundwater resources. Arnold’s insights highlight the complexity of premodern water access and the social organization that supported urban water systems.

Drugs and public health: nitazines and opioids

David Nutt presents analysis of nitazines, a class of potent opioid-like compounds that have re-emerged in the illegal drug market. Potency comparisons place nitazines alongside fentanyl and sometimes higher, making accurate dosing difficult and increasing overdose risk. The discussion covers the supply chain and precursors manufactured in China or India, with final products trafficked by cartels in the United States. The podcast advocates for testing facilities to identify substances, the establishment of safe injecting rooms, and the availability of reversal agents like naloxone and naltrexone to mitigate harm. Nutt also reflects on the broader pharmacology landscape, noting that while new pain medications are a research area, the priority is reducing misuse of existing analgesic agents rather than introducing new recreational solutions.

Closing segments and next steps

The podcast wraps with a literature update and a reminder of the show’s origins and sponsorship. The host invites listener questions and reiterates the program’s Cambridge roots while signaling upcoming topics such as James Webb Space Telescope science. A donation appeal underscores the costs of producing high-quality science content and invites ongoing support to sustain future episodes.