Patients with haematological malignancies receiving concurrent treatment or after allogeneic stem cell transplantation (HSCT) are considered to be at increased risk for acquiring influenza A (H1N1) infection (pH1N1) and influenza-associated complications leading to increased mortality. We report of a series of haematological patients with severe course of laboratory-confirmed pH1N1, including two patients after HSCT. Coagulation assays were conducted and the association between coagulation activation and poor outcome pH1N1 infection was found in the analyzed group.
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