[ABO blood groups and haemolytic disease of newborns--population-genetic analysis]

Classical works dealing with the possibility of mother-child incompatibility with regard to basic ABO blood groups give contradictory conclusions (e.g.--Matsunaga et al. 1962, Thompson et al. 1991). Bioreproductive and population-genetic indicators have been studied in a sample of live births and in two pregnancy samples characterised by different "a priori" and "a posteriori" risk assessment. The analysis points out that ABO blood groups can influence fertility of different parental pairs, with a possible impact on the assessment of the individual pregnancy risc.