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我院自１９９５年１月至１９９７年７月共收治病毒性肝炎１０８３例，其中甲乙丙丁戊庚６型病毒标志均阴性者（ＮｏｎＡ～ＧＨｅｐａｔｉｔｉｓ，ＮＡ～ＧＨ）４５例，占４２％，且均行肝穿活检。现着重就其临床特点、病毒标志阴性的原因及对策分析如下。临床资料一、病例选择?
A total of 1083 cases of viral hepatitis were admitted to our hospital from January 1995 to July 1997, in which 45 cases (42%) had nonA-GHepatitis (NA ~ GH) Liver biopsy. Emphasis on its clinical features, the negative cause of the virus and its countermeasures as follows. Clinical data First, the case selection?