[angio]

Another selection bias is that we can't say if the virus originated there, but only that it was first detected there. Even if it originated in the countryside hundreds of miles away it makes sense it was detected only after it spread to a city with the labs to discover the virus.

[ginko]

The virus was first sequenced by a lab in Shanghai. The WIV wasn't involved in the discovery of the virus.

[angio]

What I mean is that a small countryside hospital won't be able to notice there is a new type of pneumonia, while bigger cities have teams to detect that. It's the same reason why we probably had the virus circulating in europe in january but we only noticed after we started looking for it.