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Erschienen in: European Journal of Clinical Microbiology & Infectious Diseases 1/2022

16.09.2021 | Brief Report

Possible misinterpretation of penicillin susceptibility in Staphylococcus aureus blood isolate due to in vitro loss of the blaZ gene

verfasst von: Helle Brander Eriksen, Andreas Petersen, Michael Pedersen, Søren Overballe-Petersen, Anders Rhod Larsen, Barbara Juliane Holzknecht

Erschienen in: European Journal of Clinical Microbiology & Infectious Diseases | Ausgabe 1/2022

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Abstract

We describe a case of recurrent catheter-related blood stream infections (BSI) with Staphylococcus aureus, in which the first isolate tested susceptible to penicillin, while subsequent isolates were resistant. Phenotypic susceptibility correlated with the absence/presence of the blaZ gene. The in vitro stability of penicillin resistance was investigated by subculturing single colonies. In two out of five colonies, phenotypical resistance was lost after a single subculture, which correlated with loss of the blaZ gene. This in vitro phenomenon probably resulted in a very major error in the microbiology report of the first BSI, where penicillin had been recommended as treatment.
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Metadaten
Titel
Possible misinterpretation of penicillin susceptibility in Staphylococcus aureus blood isolate due to in vitro loss of the blaZ gene
verfasst von
Helle Brander Eriksen
Andreas Petersen
Michael Pedersen
Søren Overballe-Petersen
Anders Rhod Larsen
Barbara Juliane Holzknecht
Publikationsdatum
16.09.2021
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Clinical Microbiology & Infectious Diseases / Ausgabe 1/2022
Print ISSN: 0934-9723
Elektronische ISSN: 1435-4373
DOI
https://doi.org/10.1007/s10096-021-04344-w

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