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Since host genetics is an important factor in strain modification, the identification of variant Creutzfeldt-Jakob disease infection in a PRNP 129 methionine/valine heterozygous individual has raised the possibility that the properties of the variant Creutzfeldt-Jakob disease agent could change after transmission to this different genetic background and concerns that this could lead to a more virulent strain of variant Creutzfeldt-Jakob disease.
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