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. 1990 Jan;56(1):17–23. doi: 10.1128/aem.56.1.17-23.1990

A synthetic oligonucleotide probe and a cloned polynucleotide probe based on the yopA gene for detection and enumeration of virulent Yersinia enterocolitica.

G Kapperud 1, K Dommarsnes 1, M Skurnik 1, E Hornes 1
PMCID: PMC183244  PMID: 2310179

Abstract

We compared a synthetically produced 19-mer oligonucleotide probe with a polynucleotide probe consisting of a cloned fragment of the virulence gene yopA for their relative efficiencies in identification and enumeration of virulent Yersinia enterocolitica. The probes were used in DNA-DNA colony hybridization assays to differentiate 70 Yersinia strains with known plasmid profiles. All 19 strains harboring the 40- to 50-megadalton virulence plasmid were positive in the hybridization assay, whereas their isogenic derivatives lacking this plasmid were negative. Both probes correctly identified plasmid-bearing variants of Y. enterocolitica serogroups O:3, O:5,27, O:8, O:9, O:13, and O:21 from three continents. In contrast, none of the probes hybridized with DNA from 32 environmental yersiniae belonging to 26 serogroups not associated with disease. Colony hybridization was used to detect and enumerate virulent Y. enterocolitica in three artificially contaminated food samples. Despite a large background of indigenous bacteria (3 x 10(4) CFU), the efficiency of enumeration ranged from 33 to 82%. The use of nylon filters did not impair the growth of virulent yersiniae. Both probes showed a perfect concordance in their specific differentiation and enumeration of virulent Y. enterocolitica. DNA colony hybridization with these two probes permitted rapid and reliable identification of all common pathogenic serogroups without the need for enrichment or esoteric identification protocols.

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Selected References

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