In the past few weeks, 2 questions have been popping up: Is there a connection between coronavirus SARS-2/COVID-19 and blood types? Why? Let’s assume for a minute that there is something to this: In the case of malaria, we have after all seen an advantage of O and disadvantage of A: The issue: In the case of malaria, transmission appears to be essential and different from SARS-2. Blood type O conveys protection against malaria because RIFIN, a protein secreted by parasites, bonds weakly with type O blood cells while strongly linking to type A. Now we have learned the following: Blood clotting is less frequent in people with blood type O. This is only a possibility. So how about the … Continue reading COVID-19: Why would blood type matter?