Who discovered the AB blood group

What about the blood groups

The rhesus system

In addition to the AB0 system, there is the antigen D, called Rhesus factor-D, which Karl Landsteiner discovered exactly 40 years later. In addition to the blood group, it is therefore also mentioned whether someone is rhesus-positive or rhesus-negative. Often the “positive” or “negative” is put after the blood group without mentioning the term rhesus, that is, A positive, AB negative etc. About 85 percent of the white European and American population and almost 100 percent of all Africans, Asians and North American Indians are rhesus positive, the rest rhesus negative.

The rhesus factor can come into play with repeated blood transfusions of a rhesus-negative person with rhesus-positive blood or from the second pregnancy of a rhesus-negative woman with a rhesus-positive child. Then a life-threatening antigen-antibody reaction threatens. Blood donors with blood group 0 negative are also called universal donors, as their cells have no A, B or Rhesus antigens and are therefore compatible with all recipients.

A recipient with group AB positive, on the other hand, is a universal recipient, as there are no antibodies to A, B or Rhesus factor in their blood. Our figure shows the frequency of blood groups in Germany.

It is important: there is always a need for donors of all blood groups! Because frequent blood groups are accordingly required more often.