The American Red Cross data below list the rare blood type and the ethnic group in which it is most common: African American: U-negative and Duffy-negative blood types This list concerns blood type distribution between countries and regions.Blood type (also … O-positive: African-American: 47 percent; Asian: 39 percent; Caucasian: 37 percent; Latino-American: 53 percent; O-negative: African-American: 4 percent; Asian: 1 percent; Caucasian: 8 percent; Latino-American: 4 percent; A-positive: East Asian communities have 93-97% Rh+ blood. More Hispanic people, for example, have O blood type, while Asian people are more likely to be type B. The relatively rarity of this rare Blood type in the rest of the North-American population can result in a shortage of that rare Blood type for patients of African ethnicity, in need of a Blood transfusion.

From the antigen content of human blood, there are four groups of people. Each group has antibodies in its blood serum, group A, B, AB have antibodies B 2, B, and A3. For example, the rare Blood type Duffy-negative Blood, occurs much more frequently in people of African ancestry. Because blood types are genetic, they are inherited from the parents, blood types have different racial and ethnic differences. Blood types vary by ethnic group. Blood type by race/ethnicity: O-positive is the most common blood type. Here’s a breakdown of the most common and least common blood types by ethnicity, according to the American Red Cross. In the ABO blood group system, the antigens present in the human red blood cells are antigens A and B. Here's a breakdown of the most rare and common blood types by ethnicity, according to the American Red Cross. The majority of people in the world and across various ethnicities have Rh+ blood type. Subsaharan African populations have a 97-99% Rh+ factor. The blood also contains antibody A and antibody B in the serum.

In general, the rarest blood type is AB-negative and the most common is O-positive. Group A, group B, group AB, and group O have antigens A, B, A and B, and no antigen respectively.