I was wondering what that odd smell was in that bathroom in Wuhan that I visited back in December 2019.

Wei Guixian is the earliest confirmed covid patient:
https://archive.is/TfWcl

She was asked how she got sick:
“Looking back, Ms. Wei thinks she might have been infected via the toilet she shared with the wild meat sellers and others on the market’s west side.”

Via hotpot.ai

DC's COVID origin story