目的探讨主动免疫方式对接受乙型肝炎核心抗体（HBcAb）阳性供肝肝移植患儿术后新发乙型肝炎病毒（HBV）感染的预防作用。方法回顾性分析20......

Two hundred and seventy multiparous Chinese Yellow cattle (beef) were selected at 1 to 3months postpartum and divided in......