Hi Hermes!

Not positive if this completely address your comment, but this is from the 2021 study about the blood of Neanderthals and Denisovans that i linked to (if you want to explore the study further and haven’t already)

“We show that Neanderthal and Denisova were polymorphic for ABO and shared blood group alleles recurrent in modern Sub-Saharan populations. Furthermore, we found ABO-related alleles currently preventing from viral gut infection and Neanderthal RHD and RHCE alleles nowadays associated with a high risk of hemolytic disease of the fetus and newborn. Such a common blood group pattern across time and space is coherent with a Neanderthal population of low genetic diversity exposed to low reproductive success and with their inevitable demise. “

Does this help?