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Cephalosporins are commonly used drugs that interact with red blood cell membranes. They frequently cause a positive direct antiglobulin test but rarely cause hemolysis. A case of cefotetan-induced hemolytic anemia is described in which two types of antibodies were detected. One reacted with red blood cells by a hapten mechanism, the other reacted with drug to form immune complexes. This case is compared with the 13 cases of cephalosporin-induced hemolytic anemia reported to date. Understanding the interactions of red blood cells and cephalosporins is critical to the safe use of these commonly prescribed drugs.
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