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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 serotype serovar isolated from human infections in Thailand and is also among the top 20 most frequently reported Salmonella serotypes in the United States 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 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.

Pornsukarom et al. reported that all Thai Rissen isolates in this their study were multidrug-resistant and more than 90% were resistant to ampicillin, sulfisoxazole, tetracycline and streptomycin. Half Conversely, half of the Salmonella Rissen isolates in the USA were pan-sensitive and while some of US isolates were resistant to only tetracycline. Wang et al. identified observed that Salmonella Rissen human isolates (anal swabs or feces) had the common resistance profile as : ampicillin, trimethoprim-sulfamethoxazole, and tetracycline; respectively conferring to resistance genes bla_TEM, tetA, and sul3.resistance were conferred by bla_TEM, tetA, and sul3, respectively. A study from India reported on multidrug-resistant Salmonella Rissen strains (resistant to nalidixic acid, sulfamethizole, and carbanicillin) isolated from seafood in Cochin, India. Moreover, Spanish Salmonella Rissen isolated from live mussels carried mcr-1 gene and other antimicrobial resistance genes (aac(6')-Iaa, aadA1, aadA2, bla_TEM-1B, cmlA1, sul1, sul3, tet(A), and dfrA1).

Animal reservoir: Swine is the major animal reservoir of serovar Rissen, including the pork production chain. However, Salmonella Rissen can be also detected in seafoods.

Geographical distribution: Serotype Rissen has been reported especially in Asian countries such as Thailand, Vietnam, China, Japan, and VietnamIndia, 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	Rapeseed expellers	Feed materials
2022	Spain	Belgium	Turkey processed animal protein¹	Feed materials
2022	Ukraine	Germany	Sunflower cake	Feed materials
2020	Spain	Switzerland	Chorizo sausage	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:

Year	Location	Recalled food	Type
2020	France	Fuet¹	Food
2019	US: multistate	Pig ears²	Pet treats

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² This recall was caused by an a multistate human outbreak of manylinked to several Salmonella serovars, including Rissen, linked to pig ears feeding to treats for dogs.

Relevant links:1.