[snowwrestler]

> Did GP imply if a virus was leaked it must be man-made?

This is what the “lab leak” theory is. It’s why every conversation of lab leak is tied up with comments about gain of function, etc.

The interesting thing about SARS-COV-2 is that it can infect humans and cause illness (unlike the vast majority of known viruses). When people talk about the origin of the pandemic, it is the origin of this property specifically that they mean. The lab leak theory is that this property originated in a lab.

[wizofaus]

The paper I linked to above has as one hypothesis that it was a naturally occurring virus, cultures of which had been stored or worked on at the lab, and "leaked" by way of infection of workers there. Seems just as plausible as some source virus having been manipulated to increase its infectiousness to humans.