Summary.Eighteen anti‐K and three anti‐k sera were studied; each was serologically active at 37°C, with a saline agglutinating antibody titre of 1 and a higher indirect anti‐globulin titre. It is shown that saline agglutination at a titre of 1 can occur in the absence of saline agglutinating IgM anti‐K or anti‐k. No IgA anti‐K or anti
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