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A group A patient with chemotherapy-induced thrombocytopenia has had six group O apheresis platelet units this week. Today: anti-A 4+, anti-B 0; A1 cells 1+, A2 cells 1+, B cells 4+. The cells react with Dolichos lectin, the antibody screen is negative and the DAT is weakly positive. The most likely cause is:
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