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  • 1. Fang, Hong
    et al.
    Edlund, Charlotta
    Södertörn University, Avdelning Naturvetenskap.
    Nord, C E
    Hedberg, M
    Selection of cefoxitin-resistant Bacteroides thetaiotaomicron mutants and mechanisms involved in beta-lactam resistance2002In: Clinical Infectious Diseases, ISSN 1058-4838, E-ISSN 1537-6591, Vol. 35, p. S47-S53Article in journal (Refereed)
    Abstract [en]

    The beta-lactam antibiotics are the most widely used of all the groups of antimicrobials, but beta-lactam resistance is increasingly common among members of the Bacteroides fragilis group. Three major mechanisms are involved in beta-lactam resistance, and they act together in certain instances. In the present study, 2 resistant mutants (238m and 1186m) of Bacteroides thetaiotaomicron, obtained from clinical isolates (238 and 1186) by selection with increasing concentrations of cefoxitin, showed decreased susceptibilities to cefoxitin and other beta-lactam antibiotics. Alterations in both penicillin-binding proteins (PBPs) and outer-membrane proteins (OMPs) were observed in the mutants in comparison with their parent strains. The similar alteration in OMPs was also observed in clinical isolates. In conclusion, the beta-lactam-resistant mutants of B. thetaiotaomicron with deficiency in both PBPs and OMPs can be selected for by exposure to cefoxitin, and several mechanisms are involved in the beta-lactam resistance in the strains investigated.

  • 2.
    Lund, Bodil
    et al.
    Södertörn University, Avdelning Naturvetenskap. Karolinska Institutet, Huddinge University Hospital.
    Edlund, Charlotta
    Södertörn University, Avdelning Naturvetenskap. Karolinska Institutet, Huddinge University Hospital.
    Probiotic Enterococcus faecium strain is a possible recipient of the vanA gene cluster2001In: Clinical Infectious Diseases, ISSN 1058-4838, E-ISSN 1537-6591, Vol. 32, no 9, p. 1384-1385Article in journal (Refereed)
    Abstract [en]

    The characteristics of Enterococcus faecium have led to concern regarding the safety of probiotics that contain this bacterium. The results of an in vitro filter mating assay indicate that a probiotic E. faecium strain might be a potential recipient of vancomycin resistance genes.

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