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English Abstract
Journal Article
[Evaluation of two phenotypic techniques and a commercial multiplex molecular panel for the detection of different carbapenemases].
Revista Española de Quimioterapia : Publicación Oficial de la Sociedad Española de Quimioterapia 2023 October 4
OBJECTIVE: The prevalence of carbapenemase-producing Enterobacterales has increased in recent years and is considered an important public health problem.
METHODS: A total of 106 clinical samples were analyzed by different carbapenemase detection techniques: inhibition discs (ID), immunochromatographic test (ICT) and a genotypic method, comparing them with a multiplex RT-PCR as a reference method.
RESULTS: Overall, all 3 techniques exceeded 90% sensitivity, although with differences in the performance of some of them by carbapenemase type. DI had low specificity (62%) for OXA-48, while with TIC the sensitivity for NDM-type metallo-beta-lactamase (93%) was slightly lower than for OXA-48 (95%). The best results were obtained with the genotypic technique (100% overall performance).
CONCLUSIONS: Despite the lower sensitivity of TICs (especially in NDM carbapenemases) compared to molecular techniques, with the modification of the protocol we managed to increase this sensitivity and, together with the lower price, simplicity and speed, it makes this technique a good screening option.
METHODS: A total of 106 clinical samples were analyzed by different carbapenemase detection techniques: inhibition discs (ID), immunochromatographic test (ICT) and a genotypic method, comparing them with a multiplex RT-PCR as a reference method.
RESULTS: Overall, all 3 techniques exceeded 90% sensitivity, although with differences in the performance of some of them by carbapenemase type. DI had low specificity (62%) for OXA-48, while with TIC the sensitivity for NDM-type metallo-beta-lactamase (93%) was slightly lower than for OXA-48 (95%). The best results were obtained with the genotypic technique (100% overall performance).
CONCLUSIONS: Despite the lower sensitivity of TICs (especially in NDM carbapenemases) compared to molecular techniques, with the modification of the protocol we managed to increase this sensitivity and, together with the lower price, simplicity and speed, it makes this technique a good screening option.
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