[In vitro propagation system for human norovirus].

Human norovirus (HuNoV) is an infectious virus that accounts for more than half of all cases of infectious gastroenteritis, but its mechanism of infection and multiplication within the host are largely unknown. Accordingly, there are no available vaccines or specific therapeutic agents　applicable to HuNoV infection. The primary reason for this is the absence of an established in vitro culture and growth system for HuNoV. Therefore, virological analysis of HuNoV has been conducted using murine norovirus, which is most closely related to HuNoV and can be cultured in some cell-lines. Recently, several laboratories have reported successful in vitro cultivation of HuNoV using human intestinal epithelial cells, raising expectations for further advancements in HuNoV research. In this paper, we present recent findings regarding the in vitro propagation system of HuNoV.  .