Patent ID: 8663908

Claim:
A method of removing an abnormal prion protein from a blood product, comprising: filtering a blood product which contains an abnormal prion protein through a filter packed with a carrier coated with a polymer, which is formed of three units including 20 mol % or more and 40 mol % or less of a unit originating from a hydrophobic polymerizable monomer, 5 mol % or more and 13 mol % or less of a unit originating from a polymerizable monomer containing a basic nitrogen-containing part, and a unit originating from a polymerizable monomer containing a protonic neutral hydrophilic part as the balance; and recovering the filtered blood product, wherein the blood product is an erythrocyte product or plasma product; and wherein the abnormal prion protein-removing capability of the method is 2.0 or higher, the abnormal prion protein-removing capability being determined by subtracting the titer of abnormal prion protein of Supplemented Postfiltration Blood from the titer of abnormal prion protein of Supplemented Prefiltration Blood.