Assuming the equal distribution of homo- and heterozygotes, it looks like the numbers (A/AB +20%, B +3%, 0 -33%) <i>suggest</i> the following:<p>• 00 (homozygote 0, but that's the only way someone is a 0) is at -33% "chance" of catching SARS-Cov-2<p>• B0 (heterozygote B) is at -10%<p>• BB (homozygote B) is at +5%<p>• AB (well, heterozygote, obviously) is at +20%<p>• A0 (heterozygote A) is at <17%<p>• AA (homozygote A) is at ~33%<p>Basically, the hypothesis would be that presence of an A allele contributes significantly to increased risk (~17%), B is mostly neutral (+1-2%), a 0 allele contributes to decreased risk (-17%).<p>Considering the distribution in healthy individuals (I haven't run the numbers but only used roughly 30% for each group except AB which is at 10% — I've only done the math in my head so I am way more off than that, and it would be quite unlikely for the effect to be so linear as my breakdown above suggests) from the study, everything roughly lines up.<p>It would be interesting if a study could confirm that, but they'd need parents blood types for every individual to be able to get that.<p>I've seen mention of open data sets that include research articles, but is there any data set to look at? It would be quite interesting since the distribution of blood types supposedly differs strongly among "ethnicities" if <a href="https://www.livescience.com/36559-common-blood-type-donation.html" rel="nofollow">https://www.livescience.com/36559-common-blood-type-donation...</a> is to be trusted — their "Asian" number for AB is also at 7% compared to 9% in their "health population" number.<p>If there was data just documenting whatever findings there are for patients, it would help in independent "researchers" find correlations that might not be obvious to others.