Forgive the silly question, but does the lab leak theory entail the virus being engineered in the lab, or simply sampled from nature by researchers then not adequately contained?
I’m not clear on what exactly is being alleged by these agencies?
One of the key parts of the lab leak hypothesis is that, depending on who is advancing it, it ranges from "poor biocontainment of a natural virus" to "engineered and released" with everything in between.
Biocontainment just means that the virus stays in the lab and doesn't move outside it - be that the disposal of lab materials, accidental infections, etc.
Those are both examples of a hypothetical lab leak. The WIV had the largest collection of related viruses in the world sampled from nature. The WIV performed GoF research on some of those viruses. They're both plausible events. I'm not sure how you could ever distinguish between them at this point.
I’m not clear on what exactly is being alleged by these agencies?