Human noroviruses are the major cause of nonbacterial epidemic gastroenteritis worldwide. However, little is known regarding their pathogenesis or the immune responses that control them because until recently there has been no small animal model or cell culture system of norovirus infection. We recently reported the discovery of the first murine norovirus, murine norovirus 1 (MNV-1), and its cultivation in macrophages and dendritic cells in vitro.
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