Introduction
!The pathogenesis of biliary atresia (BA) is still unclear [7,17]. The most likely pathogenesis currently under consideration [5,19,21] is that certain viruses [4] induce an injury to the biliary epithelial cell, triggering a disorder of the immune system [8,10,15] which leads to several pathological changes, such as liver fibrosis, apoptosis of the biliary epithelial cell and intracellular cholestasis.