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１９９７年１２月，日本学者Ｎｉｓｈｉｚａｗａ〔１〕应用代表性差异分析法（ＲＤＡ），首次从１例原因不明的输出血后肝炎病人血清中，分离到一种新的与病毒性肝炎相关的病毒基因，命名为输血传播病毒（ｔｒａｎｓｆｕｓｉｏｎｔｒａｎｓｍｉｔｔｅｄｖｉｒｕｓ，ＴＴＶ）〔
In December 1997, Japanese scholar Nishizawa [1] applied representative differential analysis (RDA) to isolate a new viral hepatitis-related viral gene for the first time from the serum of a posthepatitic hepatitis patient with unidentified output , Named transfusion transmitted virus (TTV) [