TB: Viral (Chan & Ridley)
Core Thesis
How COVID-19 started may be the biggest scientific mystery of our lifetime. The lab-leak hypothesis — that the virus escaped from the Wuhan Institute of Virology — is not a conspiracy theory but a scientifically serious proposition supported by a specific accumulation of circumstantial evidence. China's persistent suppression of data makes a definitive answer impossible, but also makes natural origin increasingly difficult to sustain. If we cannot determine how this pandemic began, we cannot prevent the next one.
Key Takeaways
Why COVID was unusual from day one
- At the onset, COVID was evolving much more slowly than a virus that had newly jumped from a different species — implying it was already well-adapted to humans before the Wuhan outbreak.
- There is still no identified animal intermediary and no satisfying account of why the virus emerged in Wuhan, 1,000 km from where the relevant bats live, yet directly adjacent to the world's leading bat coronavirus research program.
The furin cleavage site — the most suspicious feature
- The furin cleavage site makes the virus far more infectious; it is unique among all the sarbecoviruses; it is precisely the type of sequence scientists have been deliberately inserting into other coronaviruses; and it is coded with the least common codon for coronaviruses but the most common for humans.
- It was not mentioned in the first COVID paper published by WIV scientists — despite the same authors having previously emphasized the importance of such sites to pandemic potential.
The suppressed data
- On January 3rd, China ordered all labs to destroy COVID-19 samples or transfer them to designated institutions.
- The WIV database of viruses was taken offline in early 2020 (blamed on hackers) and has not been shared privately with international scientists.
- The most closely related viruses (collected from the Mojiang mine, where miners died of a mysterious respiratory illness in 2012) were not disclosed until a year into the pandemic, and even then without sequences or experimental details.
The structure of the argument
- The case for natural origin has not been established — unlike SARS-1, where an animal intermediary was identified within months.
- The case for lab leak makes only the assumption that WIV scientists were doing what they said they were doing: collecting and studying bat viruses to predict pandemics.
- Lab leaks are rare but have happened — including from the original SARS virus, multiple times.
- "That which can be asserted without evidence, can be dismissed without evidence." The relevant standard applies symmetrically.
Evolutionary principles at stake
- Diseases that spread by direct contact evolve to low virulence. Diseases spread by vectors remain or become highly virulent. Attendant-borne illness (spread by caregivers) evolves high virulence — the sicker the patient, the more nursing visits.
Mental Models
- Second-Order Thinking — gain-of-function research was designed to preempt pandemics; the second-order risk is that it could cause one
- Absence Blindness — absence of a definitive answer is not evidence of absence; the suppression of evidence is itself informative