Paul Ewald: Can we domesticate germs?

TL;DR

This talk discusses how understanding evolutionary biology can help design interventions for controlling disease organisms, with a focus on diarrheal diseases and malaria.

Transcript

What I'd like to do is just drag us all down into the gutter, and actually all the way down into the sewer because I want to talk about diarrhea. And in particular, I want to talk about the design of diarrhea. And when evolutionary biologists talk about design, they really mean design by natural selection. And that brings me to the title of the tal... Read More

Key Insights

• 🦠 Disease organisms have evolved to be harmful because they rely on the well-being of the host to move from one host to another.

Questions & Answers

Q: How does host mobility affect the harmfulness of disease organisms?

From an evolutionary perspective, disease organisms that rely on host mobility for transmission tend to be milder, while those that can transmit without relying on host mobility are more harmful. This is because natural selection favors more exploitative organisms when transmission does not require host mobility.

Q: How can understanding the evolution of disease organisms help in controlling their harmfulness?

Understanding the factors that contribute to the harmfulness of disease organisms allows for targeted interventions. By manipulating the transmission routes, such as cleaning up water supplies or mosquito-proofing houses, it is possible to promote the evolution of mild disease organisms, effectively controlling their harmfulness.

Q: What is the significance of controlling the evolution of disease organisms?

Controlling the evolution of disease organisms, particularly the harmfulness and antibiotic resistance, can lead to more effective disease control strategies. By promoting the evolution of mild disease organisms, it is possible to reduce the severity of infections and decrease the prevalence of antibiotic resistance, resulting in improved public health outcomes.

Q: How can interventions like cleaning up water supplies and mosquito-proofing houses impact the evolutionary trajectory of disease organisms?

These interventions can influence the transmission dynamics of disease organisms. By removing the reliance on host mobility for transmission, these interventions select for milder disease organisms that rely on people being mobile and healthy for transmission. This leads to the evolution of less harmful strains over time.

Q: How can the evolution of disease organisms be manipulated to control their harmfulness?

By understanding the factors that drive the evolution of harmfulness, interventions can be designed to steer the evolution of disease organisms in a desired direction. For example, the promotion of mosquito-proof housing can select for milder strains of malaria, reducing its harmfulness. This approach can be applied to other infectious diseases as well.

Q: What are the potential benefits of integrating evolutionary biology into disease control strategies?

Incorporating evolutionary biology into disease control strategies can lead to more effective and sustainable interventions. By considering the evolutionary dynamics of disease organisms, interventions can be tailored to promote the evolution of less harmful strains, reducing the severity of infections and the development of antibiotic resistance.

Q: How can this evolutionary approach to disease control contribute to global health efforts?

This approach offers the potential for more cost-effective and long-term solutions to disease control. By understanding and manipulating the evolutionary trajectories of disease organisms, interventions can be designed to target the underlying mechanisms that drive harmfulness and antibiotic resistance. This can result in significant improvements in global health outcomes.

Summary & Key Takeaways

• The talk explores two questions: why some disease organisms are more harmful and how to control them once the answer to the first question is understood.

• It discusses how disease organisms rely on host mobility for transmission and how this affects their harmfulness.

• The talk provides examples of how interventions such as cleaning up water supplies and mosquito-proofing houses can lead to the evolution of mild disease organisms, thereby controlling the harmfulness of diseases.