Five hundred and eighteen human sera containing known red cell antibodies were tested for lymphocytotoxic antibodies and 81 sera were found to contain them. Thirty-nine antibodies were fully characterized. The frequencies of anti-I, K, Vw, and Wra were significantly greater in those of the 518 sera which also contained white cell antibodies.
Four hundred and ninety-four of the 518 sera containing red cell antibodies contained anti-Rh and anti-Kell. The frequency of white cell antibodies in this group was 15% compared with a frequency of 12% in a series of 923 antenatal samples not containing anti-Rh or anti-Kell.
The frequencies of different anti-HL-A specificities were compared in the two groups with or without anti-Rh and anti-Kell antibodies. Anti-HL-A 1, 7, and 8 occurred more frequently in the absence of these red cell antibodies and anti-HL-A 12 occurred more frequently in their presence.
No correlation was found between particular red cell and white cell antibodies.
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