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In a 73-year-old female with chronic lymphocytic leukemia we observed an acute illness with shivering, high fever, and hemolytic anemia following chlorambucil administration. Reexposure in a controlled clinical situation suggested an allergic drug reaction. In an in vitro assay, we were able to demonstrate chlorambucil as the causative agent of immune hemolysis.
Thompson‐Moya et al. (Wed,) studied this question.