Abstract
Twenty (18.5 %) out of 108 clinical isolates of the familyEnterobacteriaceae responsible for bloodstream infection were extended-spectrum β-lactamase (ESBL)-positive in two screening tests, the double disk synergy test and theOxoid Combination Disk method. Eleven out of the 20 ESBL-positive isolates transferred oxyimino-β-lactam resistance toE. coli K12 C600 recipient strain with a frequency of 10−8–10−1 per donor cell. PCR analysis revealed that the majority of the transconjugants (9 of 11) express CTX-M-type β-lactamases. Donor strains and their transconjugants displayed susceptibility patterns typical of ESBL producers. They were resistant to oxyimino-β-lactams but susceptible to clavulanic acid and carbapenems. Resistances to aminoglycosides, tetracycline and mercuric chloride were, in some cases, co-transferred with oxyimino-β-lactam resistance, suggesting that various resistance determinants were carried by the same conjugative plasmids.
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Abbreviations
- BSI:
-
bloodstream infection
- CFU:
-
colony-forming unit
- DDST:
-
double disk-synergy test
- Akc:
-
amikacin
- Amc:
-
amoxicillin
- Azt:
-
aztreonam
- Cef:
-
cefotaxime
- Cfz:
-
ceftazidime
- Cla:
-
clavulanate
- ESBL:
-
extended-spectrum β-lactamase
- OBLR:
-
oxyimino-β-lactam resistance
- OCDM:
-
Oxoid combination disk method
- Cmp:
-
chloramphenicol
- Cpd:
-
cefpodoxime
- Ctx:
-
ceftriaxone
- Gmn:
-
gentamicin
- Imi:
-
imipenem
- Mer:
-
meropenem
- Nal:
-
nalidixic acid
- Nor:
-
norfloxacin
- Pip:
-
piperacillin
- Sxt:
-
co-trimoxazole
- Ttc:
-
tetracycline
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Franiczek, R., Krzyžanowska, B., Dolna, I. et al. Extended-spectrum β-lactamase-conferring transferable resistance to different antimicrobial agents inEnterobacteriaceae isolated from bloodstream infections. Folia Microbiol 50, 119–124 (2005). https://doi.org/10.1007/BF02931459
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DOI: https://doi.org/10.1007/BF02931459