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Abstract
Class I human leucocyte antigens (HLA-A, -B) and class II (HLA-DR) antigens were determined in 57 couples with primary recurrent abortions of unknown origin and in 57 normal fertile couples. No difference between abortion and control fertile couples was observed regarding HLA sharing. Analysis of 10 series in the literature, including our own results, is against the concept that compatibility in determinants of the major histocompatibility complex has a major role in recurrent spontaneous abortion (RSA).