Phenotypic and Genotypic Characterisation of Antibiotic Resistance in <i>Escherichia coli</i>, <i>Klebsiella</i> spp., and <i>Listeria monocytogenes</i> Isolates from Raw Meat Sold in Nairobi — Oak Academic Publishing
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Phenotypic and Genotypic Characterisation of Antibiotic Resistance in <i>Escherichia coli</i>, <i>Klebsiella</i> spp., and <i>Listeria monocytogenes</i> Isolates from Raw Meat Sold in Nairobi
Department of Medical Microbiology, Jomo Kenyatta University, Nairobi, Kenya
,
Centre for Medical Microbiology, Kenya Medical Research Institute, Nairobi, Kenya
,
Department of Medical Microbiology, Jomo Kenyatta University, Nairobi, Kenya
,
Centre for Medical Microbiology, Kenya Medical Research Institute, Nairobi, Kenya
1 Department of Medical Microbiology, Jomo Kenyatta University, Nairobi, Kenya
2 Centre for Medical Microbiology, Kenya Medical Research Institute, Nairobi, Kenya
3 Department of Medical Microbiology, Jomo Kenyatta University, Nairobi, Kenya
4 Centre for Medical Microbiology, Kenya Medical Research Institute, Nairobi, Kenya
Worldwide, the increase in antimicrobial resistance (AMR) is a public health concern. Food-borne associated antibiotic-resistant pathogens can contaminate raw meat during slaughter, transportation, and at sale points. A cross-sectional study was conducted from March 2021 to December 2021 to determine antimicrobial susceptibility patterns and characterize the molecular basis of resistance in E. coli , Klebsiella spp., and L. monocytogenes contaminating raw meat collected from retail outlets in Nairobi. Isolation and identification of the strains were done using the standard culture methods and PCR. Antimicrobial susceptibilities of the recovered strains were determined using disk diffusion while the presence of antibiotic resistance gene determinants; bla TEM , bla CTX-M , bla OXA , sul, and qnrS was done using PCR. Of 270 samples collected, 163 (60%) Escherichia coli , 19 (7%) Klebsiella spp., and L. monocytogenes 3 (1.1%) were recovered. Among Escherichia coli , high antibiotic resistance was found to Erythromycin 161 (98%) and ampicillin 88 (54%) while low resistance was found against imipenem 2 (1%). Similarly, high resistance was found among Klebsiella spp. to Erythromycin 19 (100%) and ampicillin 12 (63%) low resistance to ceftazidime 1 (5%), cefotaxime 1 (5%), aztreonam 1 (5%), and chloramphenicol 1 (5%). One isolate among the three Listeria monocytogenes strains isolated was resistant to Trimethoprim-sulfamethoxazole. No resistance was exhibited to gentamycin by all Klebsiella spp. The prevalence of multidrug-resistant (resistance to three or more classes of antibiotics) isolates was 95/182 (52.2%). The common resistance pattern observed was Erythromycin, ampicillin, tetracycline, and trimethoprim-sulfamethoxazole with a prevalence of 19 (20%). ESBL was confirmed in isolates that harbored: bla TEM (65%), bla CTX-M (44%), bla OXA (33%) while sul and qnrS were detected in 46.7% and 13.6% respectively. Circulation of antibiotic-resistant and MDR isolates found in this study could play a role in the dissemination of AMR among food-borne bacteria and suggest potential food safety and public health risk. Therefore, enhanced surveillance for antibiotic-resistant organisms in raw meat for early detection of emerging resistant bacteria species in the food chain is recommended.
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