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What is the rarest blood group
The beginning of the seventeenth century physicians, doctors and scientists have performed various investigations into the haematology and the experiments have been done engaging blood transfer from one person to another person or even from one animal to a person. The early investigations resulted in different success levels and eventually, it was Karl Land Steiner who discovered that a blood of person had serum and this when mixed with the red cells of another person blood, the cells get clumped. On this situations he also classified the blood groups into 4 types such as A, O, B and AB. This blood group classification was based on the proteins called antigens as these exist on the red blood cells surface. The antigens are said to be received from the parents as inheritance and they are made up of genetic features. These experiments also stated that an antigen exists on a red blood cell indicates that the opposite antibody exists in the plasma. For instance, A blood group has anti-type B antibodies, while the B blood group show A anti-type antibodies. The Ab blood group do not have any antibodies in the plasma, while the O blood group has A and B anti-type antibodies in the plasma. These antibodies do not appear during the birth and is formed gradually in the infant stages of a child. However, they last for the entire life. It is also found that identical to the communities of the people, the languages as well as customs also change in all the countries in the world and also the blood groups are no way different. In addition to this people moving from one country to another and the marriages between different ethnic groups yet shows how the blood groups differ in populations. The blood group O is the earliest blood group and dates to the stone age period. This group is common in UK and in North of England. The A blood group was the next to be found and is prevalent in Denmark, Norway, Armenia, Austria and Japan. The blood group B is found in the tribes that emigrate from Africa to Asia, Europe and the Americas. People having Asian back ground share this blood group. The rarest blood group is the AB blood group. This is the new blood group and occurred as the blood groups got mixed on a huge scale. This blood group AB is also 500 to 1000 years old. The antibody determines Rh Positive or negative based on the blood transfusion or in the stages of pregnancy. AB negative is rarest yet, can receive blood from type O donors. So, O group is in demand. AB negative is rare in US, but not in Asia.

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