Armchair geneticist here. I have been wondering something about blood types. Could some of the "types" be the result of previous genetic experiments by nefarious entities upon humans? Rh factor leads to incompatibility if a pregnant mother is negative and the baby is positive and she is exposed to the baby's blood sensitizing her to react in subsequent pregnancies. Could this happen with "spike", too?
Not necessarily related to my question but having fewer proteins on blood cells is possibly protective from COVID illness. So O- is considered the most protective. Rh positive, A, B and AB all represent protein features on blood cells that are absent in O- as I understand it.
https://bestlifeonline.com/blood-type-covid/