Introduction Infections caused by multidrug-resistant (MDR) bacteria, extended spectrum β-lactamase (ESBL), metallo-β-lactamase (MBL) and AmpC-β-lactamase (AmpC-βL)-producers are increasing globally. This study identified bacteria in clinical and tap water samples and determined the prevalence of MDR, and β-lactamase enzymes and genes.
Methods Isolates were
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Introduction Infections caused by multidrug-resistant (MDR) bacteria, extended spectrum β-lactamase (ESBL), metallo-β-lactamase (MBL) and AmpC-β-lactamase (AmpC-βL)-producers are increasing globally. This study identified bacteria in clinical and tap water samples and determined the prevalence of MDR, and β-lactamase enzymes and genes.
Methods Isolates were identified by the Vitek 2 (bioMérieux, France) automated system. Antibiotic resistance and screening for β-lactamase enzymes and genes was done using disc diffusion method and Vitek 2 automated system, CHROMagar-ESBL, combined double disc, inhibition-based method and multiplex polymerase chain reaction, respectively.
Results The Enterobacteriaceae isolates obtained were
Escherichia coli,
Klebsiella pneumoniae,
Citrobacter freundii,
Salmonella spp.,
Proteus mirabilis,
Enterobacter aerogenes,
Shigella sonnei,
Proteus vulgaris,
Enterobacter sakazakii,
Klebsiella oxytoca,
Citrobacter diversus, and
Serratia liquefaciens. Of the 674 isolates from clinical samples, 36.5%, 28.5%, and 19.9% were ESBL, MBL, and AmpC-βL producers, respectively. A low prevalence of AmpC-βL and MBL producers were obtained, with no significant difference (
p < 0.05) between the prevalence of ESBL and non-ESBL producers. Isolates exhibited varied levels of resistance to gentamicin, amoxicillin-clavulanic acid, ciprofloxacin, and tetracycline. The results showed that 54.6% of ESBL producers, 57.9% of MBL producers, and 62.8% of AmpC-βL producers were MDR strains. Of the 141 representative isolates tested, 36.9%, 15.6%, and 20.6% had only
blaTEM,
blaSHV, and
blaCTX-M, respectively; 5.7% possessed both
blaTEM and
blaSHV; 7.1% possessed both
blaTEM and
blaCTX-M and 4.3% had both
blaSHV and
blaCTX-M.
Conclusions This study found a high prevalence of β-lactamase producers, indicating the need for further research on the molecular epidemiology of β-lactamase producers and their impacts in the region.
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