Background: Salmonelle enterica subsp. enterica serovar Enteritidis (antigenic formula 1,9,12:g,m:- ) is the most common serovar in the United States and the European Union. This serovar belongs to the serogroup O:9 (D1), its antigenic formula is 1,9,12 g,m. Typically associated with table eggs and chickens, serovar Enteritidis has caused multiple outbreaks associated with the consumption of contaminated eggs. S. Enteritidis can successfully contaminate eggs because it is adapted to the reproductive organ of laying hens. This serovar is further classified according to the susceptibility to typing phages (phage typing (PT)), the most common PT are PT8 and PT4. Molecular subtyping with Pulse field gel electrophoresis (PFGE) shows that approx. 40% of the isolates fall in the same PFGE type.
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