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Yersinia secretion apparatus (Ysa), the chromosomal type three secretion system (T3SS) is considered to contribute to virulence of high-pathogenicity Yersina enterocolitica biovar 1B. DNA-sequence of Ysa pathogenicity island was determined for clinical isolate DM0110 of Y enterocolitica 1B/08 with origin in Poland. We found a premature stop-codon in the regulatory gene ysrR (mutation at position 269). Altered ysrR was detected in all tested 78 isolates of Y enterocolitica 1B/O8 collected from clinical samples in Poland from 2004 to 2013. Since aberrations in YsrR are considered to inactivate Ysa, our findings may suggest Ysa is not indispensable for Y enterocolitica 1B/O8 to infect humans.

polish journal of microbiology

Characterisation of Yersinia secretion apparatus-pathogenicity island (Ysa-PI) of Yersinia enterocolitica 1B/O8 in Poland: an idle Ysa is a specific hallmark of the epidemic sensu stricto strain