Abstract
Immune thrombocytopenia is a rare complication associated with vancomycin. A 76-year-old male patient who was treated with vancomycin experienced severe thrombocytopenia and refractoriness as a result of platelet transfusion. Vancomycin-dependent antibodies in his thrombocytopenic serum were detected by flow cytometric analysis. The mechanism of thrombocytopenia is probably related to immunological destruction, as strongly suggested by its association with a specific drug-dependent anti-platelet antibody.
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Fig. 1.
The course of platelet count, transfusion, and the use of drugs. Thrombocytopenia was detected on day 11, and the use of vancomycin was discontinued on day 12. Abbreviations: HD, hospital day; IPF, immature platelet fraction; PC, platelet concentrates.

Fig. 2.
The results of platelet immunofluorescence test using flow cytometry. The mixture of the patient's sera and serially-diluted vancomycin using drug-free saline in lower histograms generated a fluorescence intensity greater than the control sera in upper histograms. (A) Saline/sera mixture, (B) 1:100 diluted vancomy-cin/sera mixture.
