I don’t understand this relation to blood type. I was in close quarters with a COVID positive person for nearly a month and never contracted it. Albeit, I was never tested, but I never felt sick and did not have any symptoms at all. My blood type is A+. The person I was in contact with who was diagnosed with COVID was B+. So, I’m not so sure this idea of certain blood types are more susceptible that others is accurate.
But, I am not a doctor or scientist...just a regular person who has been impacted by this whole thing. The B+ person who was diagnosed with COVID died. I haven’t so much as sneezed.
On one of the “holistic” sites I remember reading that those people with a low Vit D level were extremely susceptible to catching corona. Possible your vit D level is in great shape!
The association of blood groups was the most extensive studies I've ever seen. I find it odd it's not talked about by anyone.