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在对献血员检测了乙型肝炎病毒(HBV)和丙型肝炎病毒(HCV)后,受血者仍有发生输血后肝炎的危险,而且相当部分慢性肝炎、肝硬化患者及大部分暴发性肝炎不是由已知的甲至戊型肝炎病毒引起,说明存在可导致非甲至戊型肝炎的病毒因子。新发现的庚型肝炎病毒(GBV-C/HGV)据认为可引发肝炎,而且在普通人群中的感染率达1%～2%,但越来越多的证据表明,除GBV-C/HGV外,还存在可致非甲至戊型肝炎的其他病毒。
After testing blood donors for Hepatitis B virus (HBV) and Hepatitis C virus (HCV), there is still a risk of posttransfusion hepatitis in recipients, and a substantial proportion of patients with chronic hepatitis, cirrhosis and fulminant hepatitis Is not caused by a known hepatitis A to E virus, indicating that there are viral agents that cause non-A to E hepatitis. The newly discovered hepatitis G virus (GBV-C / HGV) is thought to cause hepatitis and infects 1% -2% of the general population, but there is growing evidence that in addition to GBV-C / HGV In addition, there are other viruses that can cause non-A to E hepatitis.