Sapovirus is a genus of viruses, in the family Caliciviridae. Humans and swine serve as natural hosts.[1] There is currently only one species in this genus: the type species Sapporo virus.[1][2][3] Together with the Norwalk virus, these are the most common cause of acute viral gastroenteritis in adults.[1][4] Unlike Noroviruses, however, Sapoviruses generally only causes mild gastroenteritis in young children.[5] The type species (and the genus by extension) is named after Sapporo, Japan where the virus was first discovered following an outbreak of gastroenteritis in an orphanage.[6]