co-infection 基本例句 猪流行性腹泻病毒 Objective To find out the influence of patients with HBV infection and transfusion- transmitted virus TTV co-infection on their clinical outcome and the replication of HBV infection. 目的探讨输血传播病毒 TTV与 HBV混合感染的情况及其对肝脏病变程度和对 HBV复制的影响。 cnki