63 year old woman presents after falling down some stairs and is found to have a small subarachnoid haemorrhage. Initial FBC normal. As she is on aspirin for coronary artery disease the neurosurgery team orders a platelet transfusion. She recovers an is sent home. One week later she returns with severe bruising and epistaxis. Platelet count is 8× 109/L, normal Hb and WCC. What is likely to be found in the history of the patient or the donor of the apheresis platelet unit?
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