I have searched a bit and asked around without an answer.
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Very early on in Covid there were studies demonstrating real correlations with blood type. Even so, all blood types had vulnerability. There's a medcram video about it if you want to search within that channel (their website is better because some of their YT vids were censored: it's the course on covid which is free); their videos are excellent explainers and very in-depth.
Thanks for the heads up!