Abstract
In 1995-2005 Salmonella enteritidis strains containing no virulence plasmids accounted for as high as 3.3% (171 strains) of the examined ones. The use of polymerase chain reaction has indicated that S. enteritidis strains that do not contain 38-MDa plasmids are simultaneously strains that have no virulence plasmid. The presence of plasmids of another molecular weight does not affect the phenotypic properties of S. enteritidis strains. The infection caused by S. enteritidis that contain no virulence plasmid is characterized by a milder gastrointestinal form of the disease, diminished dehydration, and infectious-toxic shock in patients, and high bacterial carriage rates.
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