 possibly a fetomaternal transfusion of blood from a fetus in pregnancy or occasionally a blood transfusion with D positive RBCs.[13] Rh disease can develop in these cases.[14] Rh negative blood types are much less common in proportion of Asian populations (0.3%) than they are in White (15%).[15]The presence or absence of the Rh antigens is signified by the + or − sign, so that for example the A− group does not have any of the Rh antigens.ABO and Rh distribution by country[සංස්කරණය]ප්‍රධාන ලිපිය: Blood type distribution by countryAs with many other genetic traits, the distribution of ABO and Rh blood groups varies significantly between populations and countries.Other blood group systems[සංස්කරණය]ප්‍රධාන ලිපිය: Human blood group systems32 blood-group systems have been identified, including the ABO and Rh systems.[16] Thus, in addition to the ABO antigens and Rh antigens, many other antigens are expressed on the RBC surface membrane. For example, an individual can be AB, D posit