Hanane El Hafa1, Kawtar Nayme2, Najia El Hamzaoui3, Itto Maroui4, Mohammed Sbiti5, Khalid Zerouali6, Mohammed Timinouni2, Abdelhaq Belhaj7. 1. MD, Team of Ecology and Biodiversity of Wetlands, Department of Biology, Moulay Ismail University Faculty of Sciences, BP 11201 Zitoune Meknes, Morocco. 2. PhD, Molecular Bacteriology Laboratory, Pasteur Institute of Morocco, 1, Place Louis Pasteur, 20360 Casablanca, Morocco. 3. PhD, Medical Biology Laboratory of Regional Hospital Mohammed V, Mohamed Zerktouni Street, BP 50000 Meknes, Morocco. 4. PhD, Basic Sciences Department, Faculty of Dental Medicine, Mohammed V University of Rabat, BP 6212 Madinat Al Irfane, Rabat, Morocco. 5. Dr, Microbiology Department, Moulay Ismail Military Hospital, El Hansali Street, 50000 Meknes, Morocco. 6. PhD, Microbiology Laboratory, University Hospital Center, Ibn Rochd, 1 Street Hospital, 20360 Casablanca, Morocco. 7. PhD, Team of Ecology and Biodiversity of Wetlands, Department of Biology, Moulay Ismail University Faculty of Sciences, BP 11201 Zitoune Meknes, Morocco.
Abstract
BACKGROUND: Acinetobacter baumannii is a microorganism which has been classified by the World Health Organization in the list of the bacterial strains that pose the biggest danger to human health. This study was performed to determine the susceptibility profile to carbapenems and to detect carbapenemases production in 111 A. baumannii isolates. Among these 30 are environmental isolates and 81 are from the three major hospitals in Morocco. METHODS: All strains of A. baumannii were tested against diverse antimicrobial agents (13 antibiotic drugs) by the agar diffusion test. Minimum inhibitory concentration (MIC) of imipenem on carbapenem-resistant strains (CRAB) was determined by the E-test technique. Simple phenotypic tests were used to detect carbapenemases and metallo-β-lactamases (MBLs) production including the modified Hodge test, EDTA test, and the cloxacillin test. The presence of carbapenemases-encoding resistance genes of CRAB strains was examined using polymerase chain reaction (PCR). RESULTS: Carbapenem resistance was observed in 23 clinical Acinetobacter isolates showing dissemination of the multiresistance profile. Molecular biology techniques indicated that all these strains encoded the naturally occurring bla OXA-51-like gene and were proved as A. baumannii. The bla OXA-23 gene was detected in 16 strains (69.6%). The metallo-β-lactamase bla NDM gene was detected in five isolates (21.7%). GES-type carbapenemases were found in 15 strains, the existence of three classes of carbapenemases (bla GES, bla NDM, and bla OXA-23) was detected in three strains, while none of the CRAB isolates contained the bla OXA-58, bla OXA-24, bla VIM, bla OXA-48 or bla KPC encoding genes. CONCLUSIONS: This study established baseline proof of three classes of carbapenemases producing A. baumannii in Morocco, showing the important role of surveillance in controlling their spread. GERMS.
BACKGROUND: Acinetobacter baumannii is a microorganism which has been classified by the World Health Organization in the list of the bacterial strains that pose the biggest danger to human health. This study was performed to determine the susceptibility profile to carbapenems and to detect carbapenemases production in 111 A. baumannii isolates. Among these 30 are environmental isolates and 81 are from the three major hospitals in Morocco. METHODS: All strains of A. baumannii were tested against diverse antimicrobial agents (13 antibiotic drugs) by the agar diffusion test. Minimum inhibitory concentration (MIC) of imipenem on carbapenem-resistant strains (CRAB) was determined by the E-test technique. Simple phenotypic tests were used to detect carbapenemases and metallo-β-lactamases (MBLs) production including the modified Hodge test, EDTA test, and the cloxacillin test. The presence of carbapenemases-encoding resistance genes of CRAB strains was examined using polymerase chain reaction (PCR). RESULTS: Carbapenem resistance was observed in 23 clinical Acinetobacter isolates showing dissemination of the multiresistance profile. Molecular biology techniques indicated that all these strains encoded the naturally occurring bla OXA-51-like gene and were proved as A. baumannii. The bla OXA-23 gene was detected in 16 strains (69.6%). The metallo-β-lactamase bla NDM gene was detected in five isolates (21.7%). GES-type carbapenemases were found in 15 strains, the existence of three classes of carbapenemases (bla GES, bla NDM, and bla OXA-23) was detected in three strains, while none of the CRAB isolates contained the bla OXA-58, bla OXA-24, bla VIM, bla OXA-48 or bla KPC encoding genes. CONCLUSIONS: This study established baseline proof of three classes of carbapenemases producing A. baumannii in Morocco, showing the important role of surveillance in controlling their spread. GERMS.
Authors: Neil Woodford; Matthew J Ellington; Juliana M Coelho; Jane F Turton; M Elaina Ward; Susan Brown; Sebastian G B Amyes; David M Livermore Journal: Int J Antimicrob Agents Date: 2006-03-24 Impact factor: 5.283
Authors: Elizabeth Maria Bispo Beltrão; Érica Maria de Oliveira; Ana Catarina de Souza Lopes Journal: Rev Soc Bras Med Trop Date: 2021-03-22 Impact factor: 1.581