An Unusual Salmonella Enteritidis Strain Carrying a Modified Virulence Plasmid Lacking the prot6e Gene Represents a Geographically Widely Distributed Lineage

This study identifies a strain of Salmonella enterica subspecies enterica serovar Enteritidis that harbors a highly unusual virulence plasmid. During the characterisation of a group of S. Enteritidis isolates, 10 isolates recovered from Canadian duck production facilities, of which seven were phage type 9b and three were closely related atypical phage types, failed detection by a PCR targeting the prot6e gene, a marker located on the virulence...