About 15% of the white population has a RhD-negative blood type. Population data suggest that the incidence of RhD negativity is highest among Basques (36%). Seven percent of black people have this blood type. Less than 1% of the Native American and Asian populations have this phenotype. Rh alloimmunisation due to RhD has declined markedly as immunoprophylaxis has become routine practice in the last 4 decades. Societal factors, such as delayed childbearing and smaller families, may also have contributed to this decline.
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