Rubella HI nonspecific inhibitor is removed from serum more effectively by heparin-MnCl2 than by kaolin. Heparin-MnCl2 treatment removes beta-lipoprotein from serum; kaolin does this less efficiently. Among 100 elderly persons, 99 were found to have rubella HI antibodies.
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H. A. Feldman (1968) studied this question.