Why b negative blood group is considered as a rare one?
Because B negative blood type is comprising of only 2% of the world population… B Negative Blood Type: Risks Apart from the fact that type B negative blood is rare, there are certain other risks involved. These risks are peculiar to all the negative blood groups. The main risk is during pregnancy, when the mother is Rh- and the fetus is Rh+. Human body has a tendency to build antibodies against anything that is foreign to our body. Naturally, baby’s blood is no exception as it comprises of antigens from the father (which are foreign to the mother’s body). In response to these antigens, the immune system builds antibodies of type IgG and IgM. The antibodies for the major blood groups ABO are of type IgM while those for Rh(D) are of type IgG. The antibodies of type IgM are large and cannot be transported through placenta, all the way to the baby. However, type IgG antibodies easily enter the placenta and are transferred to the baby, to attack his antigens. This can induce some risks fo
