Natural antibiotic susceptibility and biochemical profiles of Yersinia enterocolitica-like strains: Y. bercovieri, Y. mollaretii, Y. aldovae and ‘Y. ruckeri'

Biochemical and genetic characterization of the β-lactamases of Y. aldovae, Y. bercovieri, Y. frederiksenii and ‘Y. ruckeri’ strains

“…The expression of chromosomally-encoded ␤-lactamases represents the most common mechanism contributing to ␤-lactam resistance in Enterobacteriaceae. From the ␤-lactam MIC values revealed recently, it is likely that strains of Y. bercovieri and Y. frederiksenii express chromosomally-encoded AmpC ␤-lactamases either alone (Y. bercovieri) [4] or together with chromosomal class A ␤-lactamases (Y. frederiksenii) [5]. Strains of Y. aldovae and 'Y.…”

“…In two previous studies, the natural susceptibility patterns of all known Y. enterocolitica-like species were investigated using a range of antimicrobial agents [4,5]. Among the ␤-lactam antibiotics tested, species-specific differences in susceptibility were seen with aminopenicillins, ticarcillin and some cephalosporins.…”

Evolutionary Dynamics of the Yersinia enterocolitica Complex

“…enterocolitica-like species (Stock, Henrichfreise and Wiedemann, 2002;Merhej, et al, 2008). Especially with identification of new species in the genus, the list of possible phenotypic tests is growing and might become unmanagle, confusing, and impractical.…”

“…There have been reports however of strains with atypical biotyping reactions (Guiyoule, et al, 1998) as well as high-pathogenic strains that lack the typical invasive phenotype, and which cluster with non-pathogenic BTs in microarray and AFLP analysis (Fearnly, et al, 2005;Howard, et al, 2006;McNally, et al, 2006;personal communication M. Prentice). This variability arises because biotyping is affected by the media used for culturing of the strain before typing and is subject to incubation time and temperature (Wauters, Kandolo and Janssens, 1987;Bottone, 1999;Cornelis, et al, 1987;Farmer, et al, 1992;Stock, Henrichfreise and Wiedemann, 2002;personal communication E. Carniel).…”

“…A selection of biochemical tests for species designation is listed in Table 1.1. There is no one typing scheme used for Yersinia, and the most commonly used key tests are presented (Bottone, 1997;Stock, Henrichfreise and Wiedemann, 2002).…”