Donadu Matthew Gavino; Zanetti Stefania; Nagy Ádám László; Barrak Ibrahim; Gajdács Márió: Insights on carbapenem-resistant Acinetobacter baumannii : phenotypic characterization of relevant isolates. In: Acta biologica Szegediensis, (65) 1. pp. 85-92. (2021)
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Acinetobacter baumannii (A. baumannii) is an important nosocomial pathogen, which may be a causative agent in a wide-range of human pathologies. Carbapenems are usually considered the last safe and effective choice of drugs for the treatment of Gram-negative infections. The emergence of carbapenem-resistant A. baumannii (CRAB) is a critical public health issue as they leave clinicians with limited therapeutic options. In this study, phenotypic methods were used to characterize sixty-two (n = 62) A. baumannii isolates, which were included based on their suspected non-susceptibility to meropenem. Minimum inhibitory concentrations (MICs) of meropenem, levofloxacin, gentamicin, sulfamethoxazole/trimethoprim, tigecycline were determined using E-tests, while colistin MICs were determined using broth microdilution. The isolates were subjected to the modified Hodge test (MHT), the modified carbapenem-inactivation method (mCIM) and the imipenem/EDTA combined disk test (CDT). Efflux pump overexpression was studied using agar plates containing phenylalanine-arginine β-naphthylamide (PAβN). Assessment of biofilm-formation was carried out using the crystal violet tube-adherence method. 64.5% of the strains showed meropenem MICs in the resistant range (>8 mg/L), resistance rates were similarly high to the other tested antibiotics. The MHT and mCIM assay were positive in 79.0% and 67.7% of cases, respectively; the presence of an MBL was suggested for 29.0% of isolates. Efflux-pump overexpression was seen in 12.9% of isolates. 54.8% of the isolates were characterized as strong biofilm-producers. Microbiology laboratories have an important role in differentiating the distinct mechanisms by which these pathogens develop the CRAB phenotype, as plasmid-borne carbapenemases are significant from the standpoint of public health microbiology.
| Mű típusa: | Cikk, tanulmány, mű |
|---|---|
| Befoglaló folyóirat/kiadvány címe: | Acta biologica Szegediensis |
| Dátum: | 2021 |
| Kötet: | 65 |
| Szám: | 1 |
| ISSN: | 1588-4082 |
| Oldalak: | pp. 85-92 |
| Nyelv: | angol |
| Kiadó: | University of Szeged |
| Kiadás helye: | Szeged |
| Befoglaló mű URL: | http://acta.bibl.u-szeged.hu/75563/ |
| DOI: | 10.14232/abs.2021.1.85-92 |
| Kulcsszavak: | Biokémia, Mikrobiológia |
| Megjegyzések: | Bibliogr.: p. 89-92. ; összefoglalás angol nyelven |
| Szakterület: | 01. Természettudományok 01. Természettudományok > 01.06. Biológiai tudományok |
| Feltöltés dátuma: | 2022. máj. 12. 09:45 |
| Utolsó módosítás: | 2022. máj. 12. 09:45 |
| URI: | http://acta.bibl.u-szeged.hu/id/eprint/75583 |
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