And what usually happens when you transfuse incompatible blood? I am not an expert in these matters, but it seems to me that this is obvious, human blood is not suitable for every person.
It depends on where you enter it for yourself) Sometimes people simply amaze with their inadequate creativity. I read honey. reports, where one guy injected his own blood into his penis with a syringe, thinking that it would help him during intercourse. Well, I got infected and then hospitalized in an ambulance.
So it was HIS blood. And if you inject yourself the blood of another animal intravenously, then you may even die of incompatibility if you do not receive timely medical assistance. It also depends on the amount of injected blood.
Previously it was believed that there is a certain pattern in the compatibility of blood groups during transfusion. For example, the first blood group is a universal donor. Then they also noticed that the Rh factor should coincide. Now it is believed that a person can only be transfused with his blood group with a coincidence in the Rh factor, and even so, this is a risk, because the special properties of blood are described by far not only these two indicators.
Animal blood differs in protein composition from human blood. The only option is to transfuse blood from humanoid apes, but there are also many risks. By the way, according to one of the hypotheses, it was these experiments that led to the fact that humanity became infected with HIV.
In general, there was already the same question. You know, on many resources, the moderator simply throws you links to the previous question, asks you to use the search on the site and not make duplicates unnecessarily.