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Background: Salmonella enterica subsp. enterica serovar Rissen (antigenic formula 6,7,14:f,g:-) is a serovar of the O:7 (C1) serogroup. This serovar was first nomenclating by Rohde & Tiedje during early 1960s. Serovar In Japan, Kaneko reported the first isolate of S. Rissen from patients with sporadic diarrhea was found during the period from April 1985 to December 1994 in Yamanashi Prefecture. Recently, serovar Rissen is the 4th most common nontyphoidal nontyphoidal Salmonella serovar isolated from human infections in Thailand.
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Geographical distribution: Serotype Rissen has been reported especially in Asian countries such as Thailand, Vietnam, China, Japan, and India, but it has also been found in Italy, France, Spain.
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12. https://www.jstage.jst.go.jp/article/kansenshogakuzasshi1970/69/11/69_11_1294/_article