Published in:
Open Access 01-12-2017 | Research
Co-existence of bla OXA-23 and bla NDM-1 genes of Acinetobacter baumannii isolated from Nepal: antimicrobial resistance and clinical significance
Published in: Antimicrobial Resistance & Infection Control | Issue 1/2017
Login to get accessAbstract
Background
Molecular analysis of carbapenem-resistant genes in Acinetobacter baumannii, an emerging pathogen, is less commonly reported from Nepal. In this study we determined the antibiotic susceptibility profile and genetic mechanism of carbapenem resistance in clinical isolates of A. baumannii.
Methods
A. baumannii were isolated from various clinical specimens and identified based on Gram staining, biochemical tests, and PCR amplification of organism specific 16S rRNA and bla
OXA-51 genes. The antibiotic susceptibility testing was performed using disc diffusion and E-test method. Multiplex PCR assays were used to detect the following β-lactamase genes: four class D carbapenem hydrolyzing oxacillinases (bla
OXA-51, bla
OXA-23, bla
OXA-24 and bla
OXA-58). Uniplex PCRs were used to detect three class B metallo-β-lactamases genes (bla
IMP, bla
VIM and bla
NDM-1), class C cephalosporin resistance genes (bla
ADC), aminoglycoside resistance gene (aphA6), and ISAba1 of all isolates. Insertion sequence ISAba125 among NDM-1 positive strains was detected. Clonal relatedness of all isolates were analyzed using repetitive sequence-based PCR (rep-PCR).
Results
Of total 44 analyzed isolates, 97.7% (n = 43) were carbapenem-resistant A. baumannii (CR-AB) and 97.7% (n = 43) were multidrug resistant A. baumannii (MDR-AB). One isolate was detected to be extremely drug resistant A. baumannii (XDR-AB). All the isolates were fully susceptible to colistin (MICs < 2 μg/ml). The bla
OXA-23 gene was detected in all isolates, while bla
NDM-1 was detected in 6 isolates (13.6%). Insertion sequence, ISAba1 was detected in all of bla
OXA-23 positive isolates. ISAba125 was detected in all bla
NDM-1 positive strains. The bla
ADC and aphA6 genes were detected in 90.1 and 40.1%, respectively. The rep-PCR of all isolates represented 7 different genotypes.
Conclusion
We found high prevalence of CR-AB and MDR-AB with bla
OXA-23 gene in a tertiary care hospital in Nepal. Systemic network surveillance should be established for monitoring and controlling the spread of these resistant strains.