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Background: Salmonella enterica subsp. enterica serovar Infantis (antigenic formula 6,7,14:r:1,5) is a serovar of serovar of the O:7 (C₁) serogroup. S. Infantis is a serovar globally distributed, which is typically commonly found in chickens and broiler flocks. In a number of European countries, serovar Infantis is commonly isolated from broiler flocks. Outbreaks addition, outbreaks caused by S. Infantis have been associated with pet food and treats. In European countries, a multidrug-resistant (MDR) strain of S. Infantis was disseminated; this strain was originally found in emerged from broilers in Hungary (Hungarian clone of S. Infantis). Resistant pattern of this Hungarian clone included resistance to: nalidixic acid, streptomycin, sulphonamide, and tetracycline. In Italy, an MDR strain of S. Infantis that showed resistance to ampicillin, chloramphenicol, streptomycin, sulphonamide, tetracycline, kanamycin and trimethoprim/sulfamethoxazole emerged in 2005-06.

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Outbreaks: Outbreaks linked to poultry and pet food have been reported in the U.S. and Canada.

Year	Location	Associated source	Number of cases
2024	US-multistate	Backyard poultry	409^a
2019	US-multistate	Raw chicken	129
2017	US-multistate	Papaya	4*
2013	US-multistate	Live poultry	125
2012	US-multistate	Dry dog food	49
2012	US-multistate	Live poultry	195
1999	Canada	Pig ear dog treats	35

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*This outbreak included multiple serovars

^a Multiple serovars, including Salmonella Altona, Cerro, Enteritidis, Indiana, Infantis, Johannesburg, Mbandaka, and Typhimurium, were linked to this outbreak. The case number represents the total number of cases associated with the outbreak and does not specifically indicate the number of people infected by Salmonella Infantis.

Border Rejections and Recalls:

Year	Exporting Country (if applicable)	Country Issuing Recall/Rejection	Food
2019	Poland	Lithuania	Chicken Wings

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