Abstract
The three main varieties of anti-Rh sera formerly identified by the percentages of important reactions obtained in the white race of 87%, 85% and 73% may now be called anti-Rh1.2, anti-Rh1, and anti-Rh2 respectively, the first containing > 1 antibody. Racial studies indicate a strong correlation between negative reactions with anti-Rh1 serum and incidence of erythroblastosis fetalis.

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