ADAMTS13 and thrombotic thrombocytopenic purpura: In concurrence with the previous reports, in the current investigation, the anti‐ADAMTS13 IgG concentration was assessed in 90% of the positive anti‐ADAMTS13 IgG antibodies in this HIV‐associated TTP (53/59) plasma, this indicates the immune‐mediated activity against HIV‐associated TTP patients.