Microbiological quality and antibiotic resistance profile of enteropathogenic Escherichia coli isolated from farm milk, curdled milk and fresh milk sold of Ouagadougou and Pabre, Burkina Faso

Document Type : Original Article

Authors

1 Département de Biochimie-Microbiologie, Laboratoire de Biochimie et d’Immunologie Appliquées, Université Joseph KI-ZERBO, 03 BP 7021 Ouagadougou 03, Burkina Faso

2 Département Technologie Alimentaire (DTA), Centre National de Recherche Scientifique et Technologique (CNRST) / Institut de Recherche en Sciences Appliquées et Technologies (IRSAT) / Direction Régional de L’Ouest, 03 B.P.2393 Bobo - Dioulasso 03, Burkina Faso

Abstract

Background: Antibiotic resistance constitutes a key challenge to global public health and is on an alarming rise. In Nigeria, this quagmire has been extensively studied in clinical settings but not in the environmental sector, particularly in landfill leachates. Aim: We aimed to assess the susceptibility profile of Escherichia coli from leachate obtained from Lapite dumpsite, to determine the potential of dumpsite leachate as a source of ESBL-producing E. coli. Methods: Cefotaxime-resistant E. coli was isolated on cefotaxime-enriched chromogenic medium and identified via PCR using the uidA gene. The confirmed isolates from the pool were assessed for susceptibility to antibiotics using the disc-diffusion method, while the phenotypic detection of ESBL production was done using the double disc synergy test. Detection of ESBL genes was done using primer-specific PCR. Results: Twenty-three ESBL-producing E. coli were obtained, and they showed 100% resistance to cefotaxime and cefpodoxime, with 60.87% resisting imipenem (a carbapenem). However, none of the isolates was resistant to amoxicillin-clavulanate. The resistance to other antibiotics tested was: gentamicin (4.35%), ciprofloxacin (17.39%), nalidixic acid (26.09%), ceftazidime (26.09%) and chloramphenicol (30.43%). Seventy-four percent of the isolates had multiple antibiotic resistance index (MARI) greater than 0.3, with 30.4% (n=7/23) exhibiting multidrug resistance phenotypes. All the isolates carried blaCTX-M, but none harboured blaSHV or blaTEM. Conclusion: Landfill leachates could contribute to the evolution of antibiotic-resistant ESBL-producing E. coli harbouring ESBL genes. There should be effective precautionary methods in place to prevent dumpsite leachates from flowing into adjoining environment to safeguard public and environmental health.

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