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Pornsukarom et al. reported that all Thai Rissen isolates in their study were multidrug-resistant and more than 90% were resistant to ampicillin, sulfisoxazole, tetracycline and streptomycin. Conversely, half of the Salmonella Rissen isolates in the USA were pan-sensitive while some were resistant to only tetracycline. Wang et al. observed that Salmonella Rissen human isolates (anal swabs or feces) had the common resistance profile: ampicillin, trimethoprim-sulfamethoxazole, and tetracycline; resistance were conferred by blaTEM, tetA, and sul3, respectively. A study from India 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, blaTEM-1B, cmlA1, sul1, sul3, tet(A), and dfrA1).
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