Background: Salmonella enterica subsp. enterica serovar Infantis (antigenic formula 6,7,14:r:1,5) is a serovar of the O:7 (C1) serogroup. S. Infantis is a serovar globally distributed, which is typically found in chickens. In a number of European countries, serovar Infantis is commonly isolated in broiler flocks. Outbreaks caused by S. Infantis have been associated with pet food and treats. In European countries, a multidrug-resistant (MDR) Hungarian clone of S. Infantis of broiler origin is widespread. Resistant pattern of this clone includes resistance to nalidixic acid-streptomycin-sulphonamide-tetracycline. In Italy, an MDR strain of S. Infantis showing resistance to ampicillin (A), chloramphenicol (C), streptomycin (S), sulphonamide (Su), tetracycline (T), kanamycin (K) and trimethoprim/sulfamethoxazole (Sxt) emerged in 2005-06.
Animal reservoir: The main animal reservoir of serovar Infantis are poultry and swine. In Europe layer and broiler farms are the major sources of S. Infantis.
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