The premise is that if you can donate blood to someone, it is easier for you to transmit a virus to them. This agrees with observations that though AB is rare and more data needed, AB might in fact be worst off when it comes to getting infected with the coronavirus SARS-2.
There are many other factors in place, but this particular part is about infection and spreading.
Overall, the likelihood to get infected is said to be:
AB>A>B>O
That would mean:
O can easily catch it from O. A from A and O. B from B and O, but since B frequencies are so low, A is more likely to catch it due to high percentages of blood type A people in this world.
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This data relates to transmission of SARS-2 coronavirus 2. For data on blood types and incubation and COVID-19 deaths, continue here…