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there were some but I don't think they could draw any conclusions that were 100% accurateEarly on in the pandemic blood type was briefly mentioned as a contributing factor for moderate/severe symptom development. IIRC type A was the most hammered type, but the information was sketchy, based on small sample sizes, and incomplete. I have no idea if that line of thought was ever studied rigorously as a factor or if there was really anything to it when the sample sizes were increased. The CDC tracked it in their demographics at one point but I have no idea if they still are.