Background: Salmonella enterica subsp. enterica serovar Hadar (antigenic formula 6,8:z10:e,n,x) is a serovar of the O:8 (C2-C3) serogroup. S. Hadar is a common serovar in the U.S. and Europe; associated with turkey and other birds, it is commonly found in ground turkey and chicken meat. In Europe, this serovar emerged in the 1971. In England, for exampleFor example, in England, before 1971 were only eight human cases reported, but by 1979 a total of 1,600 human salmonellosis cases were confirmed to be caused by S. Hadar. Â Consequent to the S. Hadar emergence, a phage typing scheme was developed, this included 35 recognized phage types. In 2011, an outbreak associated with turkey burgers occurred in the U.S., the outbreak strain showed resistance to several antibiotics commonly used to treat salmonellosis (ampicillin, amoxicillin/clavulanate, cephalothin, and tetracycline).
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