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. 1992 May;30(5):1301–1303. doi: 10.1128/jcm.30.5.1301-1303.1992

Changing clonal patterns of Salmonella enteritidis in Maryland: evaluation of strains isolated between 1985 and 1990.

J G Morris Jr 1, D M Dwyer 1, C W Hoge 1, A D Stubbs 1, D Tilghman 1, C Groves 1, E Israel 1, J P Libonati 1
PMCID: PMC265270  PMID: 1583136

Abstract

We examined isolates from 203 sporadic and outbreak-associated Salmonella enteritidis cases occurring in Maryland between 1985 and 1990. Plasmid profiles were determined for all isolates; 52 isolates were phage typed. Ten plasmid profiles were identified. A single profile (consisting of a single ca. 55-kb plasmid) emerged as the predominant profile in Maryland during the study period. This profile (which was closely associated with phage type 8) accounted for 86% of a group of isolates from sporadic cases in 1988 and 1989, compared with 43% of the 1985 isolates. Strains with this profile were identified in four of nine outbreaks, including one of three outbreaks in which eggs were implicated as a vehicle. While plasmid profiles and phage typing appear to provide complementary means of identifying specific strains of S. enteritidis, the emergence of what appears to be a single predominant clone has reduced the discriminant ability of both typing systems. The factors be a single predominant clone has reduced the discriminant ability of both typing systems. The factors contributing to the emergence of this one clone are still not well understood.

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Selected References

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