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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 isolated from HOST in LOCATION in YEAR. Serovar nomenclating by Rohde & Tiedje during early 1960s. 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.
NCBI PD link for serovar Rissen: https://www.ncbi.nlm.nih.gov/pathogens/isolates/#taxgroup_name:(%22Salmonella%20enterica%22)%20AND%20computed_types:(%22serotype=Rissen%22)
Genetic characteristics: Serovar Rissen has been found to be polyphyletic with three lineages identified and one stand-alone singleton that does not cluster with any other Salmonella Rissen isolates. Serovar Rissen ST469 has been found worldwide, in countries such as as Thailand, China, and Italy. This sequence type is the most common ST for serovar Rissen. ST8877 has been isolated from a cracked table egg in Sudan.
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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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Year | Exporting country | Importing country | Associated source | Product category |
| 2024 | Denmark | Finland | Feed materials | |
| 2022 | Spain | Belgium | Feed materials | |
| 2022 | Ukraine | Germany | Feed materials | |
| 2020 | Spain | Switzerland | Meat and meat products (other than poultry) | |
| 2020 | Belgium | Austria | Dog feed2 | Pet food |
1 Salmonella Rissen and Muenster were found.
2 Salmonella Rissen and monophasic Typhimurium were found.
Recalls:
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2 This recall was caused by a multistate human outbreak linked to several Salmonella serovars, including Rissen, linked to pig ears treats for dogs.
Relevant links:1.
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- https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2025.1547190/full
- https://www.veterinaryworld.org/Vol.16/May-2023/6.html
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