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. 1985 Oct;50(4):767–771. doi: 10.1128/aem.50.4.767-771.1985

Isolation of Yersinia enterocolitica and related species from foods in France.

C L Delmas, D J Vidon
PMCID: PMC291745  PMID: 4083878

Abstract

The occurrence of Yersinia enterocolitica and related species (Y. intermedia, Y. frederiksenii, Y. kristensenii) in foods from France was investigated by using different enrichment procedures. Initially, seven procedures were evaluated with pork products. These methods included a cold preenrichment in yeast extract-rose bengal broth or in phosphate-sorbitol-bile medium, followed by selective enrichment either in Pastone-sucrose-Tris-azide broth, in modified Rappaport broth, or in bile-oxalate-sorbose broth, and then isolation onto Hektoen or cefsulodin-irgasan-novobiocin agar with or without KOH pretreatment. The best enrichment procedure in terms of percentage of positive samples obtained within the shortest time was the combination of phosphate-sorbitol-bile and bile-oxalate-sorbose with alkali treatment before isolation onto cefsulodin-irgasan-novobiocin agar. This system was then used to analyze foods other than pork. An average contamination rate of 33.5% was observed for 666 samples analyzed; pork products were by far the most contaminated, especially the so-called tartinette (96.8% of positive samples) which contained up to five different strains of Yersinia spp. Environmental serogroups of Y. enterocolitica O:5, O:39,41, O:6, and O:7,8 were predominant, but no isolate of either human pathogenic type (O:3 or O:9) was obtained.

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Selected References

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