First Report Occurrence of CIT and DHA AmpC β-lactamase Gene in Escherichia coli and Klebsiella pnuemoniae from Clinical Sample in South Eastern, Nigeria
Peace Oluchi Akpu
Department of Applied Microbiology, Faculty of Science, Ebonyi State University, Abakaliki, P.M.B. 53, Nigeria.
Henrietta Onyinye Uzoeto
Department of Microbiology, Faculty of Pure and Applied Science, Federal College of Dental Technology and Therapy, Trans Ekulu, P.M.B. 01473, Enugu, Nigeria.
Ikemesit Udeme Peter *
Department of Applied Microbiology, Faculty of Science, Ebonyi State University, Abakaliki, P.M.B. 53, Nigeria and Department of Public Health, Faculty of Health Technology and Engineering, Federal College of Dental Technology and Therapy, Trans-Ekulu, P.M.B. 01473, Enugu, Nigeria.
Onyinye Lovette Nomeh
Department of Applied Microbiology, Faculty of Science, Ebonyi State University, Abakaliki, P.M.B. 53, Nigeria.
Agabus Chidiebube Nwuzo
Department of Applied Microbiology, Faculty of Science, Ebonyi State University, Abakaliki, P.M.B. 53, Nigeria.
Rebecca Chinenye Ogba
Department of Applied Microbiology, Faculty of Science, Ebonyi State University, Abakaliki, P.M.B. 53, Nigeria and Department of General Studies, Science and Technology, Federal Polytechnic, Ohodo, P.M.B. 01801, Enugu, Nigeria.
Ifeanyichukwu Romanus Iroha
Department of Applied Microbiology, Faculty of Science, Ebonyi State University, Abakaliki, P.M.B. 53, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
Background and Objectives: Over time, the enzymes AmpC β-lactamases have become more significant, due to their roles in antibiotic resistance among enterobacteriaceace especially in Escherichia coli and Klebsiella pnuemoniae. Due to increase multidrug resistant express by AmpC β-lactamases producing bacteria strain, the patients care in several hospital has been severely hampered. Hence, this study was designed to assess the occurrence of CIT and DHA AmpC β-lactamase gene in Escherichia coli and Klebsiella pnuemoniae from clinical sample in south eastern, Nigeria
Methodology: This study was conducted over an 8-month period on sixteen (16) non-repetitive clinical isolates of Escherichia coli and Klebsiella pnuemoniae collected from medical microbiology laboratory unit of Alex Ekweume Federal University Teaching Hospital in Abakaliki, Nigeria. The isolates were further identified using Standard microbiological Techniques and screened for cefoxitin resistance using a disc diffusion assay, followed by phenotypic tests using phenyl boronic acid assays for confirmation of AmpC β-lactamases production. Escherichia coli and Klebsiella pneumoniae strains were further screen for AmpC β-lactamase CIT and DHA genotype by polymerase chain reactions
Result: Of the sixteen (16) confirmed phenotypic AmpC β-lactamase producing bacteria, 100% of the AmpC β-lactamase genes (DHA and CIT) were detected in E. coli from wound and urine samples from both male and female patients. The overall proportion of AmpC β-lactamases gene in Klebsiella pneumoniae were DHA (100 %) and CIT (100 %), in both male and female.
Conclusion: This study indicate the occurrence of CIT and DHA AmpC genotype. The detection of AmpC β-lactamases in this study is of clinically importance as such bacteria are often MDR. Thus, being aware of the presence of AmpC β-lactamase-producing bacteria could be very beneficial for achieving more accurate epidemiological results as well as controlling their spread, while surveillance is required to track any further dissemination and emergence of other AmpC β-lactamase genotypes.
Keywords: AmpC β-lactamases, Escherichia coli, Klebsiella pneumoniae, CIT, DHA