Seasonal Flu as a Triggering Factor for Acquired Thrombotic Thrombocytopenic Purpura

A 47 years old woman was admitted to our intensive care unit for acute asthma. An infection by influenza virus A was diagnosed and the patient presented during her hospitalization signs of thrombotic microangiopathy. Biologic analysis showed low A Desintegrin and Metalloproteinase with ThromboSpondin 1 motifs member 13 (ADAMTS13) activity and positive anti-A Desintegrin And Metalloproteinase with ThromboSpondin 1 motifs member 13 antibodies. Diagnosis of Acquired Thrombotic Thrombocytopenic Purpura was considered and a specific treatment was started with plasma exchange and intravenous administration of rituximab for relapse. Acquired Thrombotic Thrombocytopenic Purpura is considered an auto-immune disease. As such, it can be triggered by bacterial or viral infection. Many triggering factors have been described. Testing for influenza virus should be considered in epidemic situations when a Thrombotic Thrombocytopenic Purpura is diagnosed.