Blood samples of 811 mother-child pairs from Bengalee Hindu caste grou
ps were utilised to study the interaction between ABO blood groups and
haptoglobin systems. There was no significant difference in the hapto
globin distribution between mothers and children. Significantly higher
incidences of HP1 were noted in the offspring born to ABO-incompatib
le mother-child combinations in comparision to offspring born to ABO-c
ompatible combinations.