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. 1987 May;25(5):802–807. doi: 10.1128/jcm.25.5.802-807.1987

Clinical significance of virulence-related assay of Yersinia species.

M A Noble, R L Barteluk, H J Freeman, R Subramaniam, J B Hudson
PMCID: PMC266092  PMID: 3584418

Abstract

During the 42-month period from June 1982 through December 1985, 215 fecal specimens from 171 patients were found to be positive for yersiniae by using a combination of CIN agar and cold enrichment. Isolates were tested for markers of virulence including carriage of a plasmid 42 megadaltons in size, calcium dependence, autoagglutination, Congo red uptake, pyrazinamidase activity, fermentation of salicin, and hydrolysis of esculin. The results were correlated to symptoms in patients. A total of 80 Yersinia enterocolitica and 52 Y. enterocolitica-like strains (42 Y. frederiksenii, 8 Y. intermedia, and 2 Y. kristensenii) were examined. Positive virulence-related tests were as follows (for Y. enterocolitica, Y. frederiksenii, Y. intermedia, and Y. kristensenii, respectively): pyrazinamidase negativity, 12.5, 0, 0, and 50%; Congo red positivity, 5, 7.1, 87.5 and 0%; calcium dependence, 3.8, 0, 0, and 0%; autoagglutination positivity, 8.8, 0, 0, and 0%; carriage of the 42-megadalton plasmid, 28.6, 73.2, 5.7, and 0; salicin and esculin negativity, 12.5, 0, 0, and 50%. The isolates recovered from symptomatic patients were characterized in relation to the presenting symptoms. Isolates from 12 of 32 (37.5%) patients with acute-onset diarrhea and 9 of 30 (30.0%) patients with chronic symptoms expressed at least one virulence feature. No individual test or group of tests was consistently associated with onset or either type of symptoms. Routine testing of plasmid carriage, uptake of Congo red, calcium dependence, autoagglutination, and pyrazinamidase activity did not appear to provide information that would link the presence of symptoms with the virulence potential of fecal isolates of yersiniae.

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Selected References

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