Here is one, I'm sure there's more: https://www.biorxiv.org/content/10.1101/2021.04.15.440089v4 https://www.biorxiv.org/content/10.1101/2021.04.15.440089v4 I d

Here is one, I'm sure there's more: https://www.biorxiv.org/content/10.1101/2021.04.15.440089v4 https://www.biorxiv.org/content/10.1101/2021.04.15.440089v4 I don't remember where I read it or why exactly they did it, but I read this is already used to be able to test whether your antibodies come from natural infection or vaccination.