Microbiology Research Journal International
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Chief Editor: Prof. En Tao Wang
ISSN: 2456-7043
Frequency: Quarterly
Language: English
Open Access Peer-reviewed journal
Web site: https://www.journalmrji.com/index.php/MRJI
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Browsing Microbiology Research Journal International by Subject "Acinetobacter baumannii"
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Item Multi Drug Resistance and Multi Antibiotics Resistance Index of Acinetobacter baumannii Isolated from Hospitals in Port Harcourt Metropolis(Microbiology Research Journal International, 2022-08) Duruike, P. N; Affia, A; Nyenke, C. U; Konne, F. E.Acinetobacter species are aerobic gram-negative bacilli that can cause healthcare-associated infections and can survive for prolonged periods in the environment. Also on the hands of healthcare workers, infection due to Acinetobacter species is a major challenge within the health care facilities and the community in general due to their high drug resistance. The study was aimed at detecting multi drug resistance and multi antibiotics resistance index (MARI) of acinetobacter baumannii isolated from hospitals in Port Harcourt meteropolis in Rivers State, Nigeria. The cross sectional study sampled randomly; as urine and wound swab samples were collected from patients. Acinetobacter spp was isolated using standard microbiological methods. Identification of A. baumannii isolates were done using Phynotypic methods such as culture on Lead Acinetobacter medium and conventional biochemical tests. Antimicrobial susceptibility test was done by Kirby Bauer’s disk diffusion method under Clinical Laboratory Standards Institute (CLSI, 2013) guide Suspect Acinetobacter species were further identified using polymerase chain reaction (PCR) and Sanger sequence typing methods. The results of confirmatory sequence typing of isolates showed that 9 of suspect Acinetobacter spp were A. baumannii. The results of this finding showed presence of A. baumannii species resistant to conventional antibiotics. All isolates demonstrated.MDR and XDR. MARI was high. (>0.2) indicating MDR and high risk. This study established high rate of multidrug resistant Acinetobacter baumanii. There is need for improved sanitary working condition and proper patients’ management to reduce the spread of this health care associated infection as well as a Search for new therapeutic alternative and policies to control the use of antibiotics.Item A Rapid Method to Screen for Multi Drug Resistance (MDR) Trait in Clinical Isolates of Acinetobacter baumannii-Acyl Homoserine Lactone (AHL) Screening in CRAB and CSAB Isolates(Sciencedomain International, 2023-05) Kamaraju , S; Sritharan , V; Giri, A.Aims: Our proposal aimed to evaluate Acyl Homoserine Lactones (AHL) as a functional marker for Multi drug resistant (MDR) potential in clinical isolates of Acinetobacter baumannii. We investigated the AHL production potential of clinical isolates using a biosensor assay directly on a commonly used agar media. Place and Duration of Study: Department of Molecular Diagnostics and Biomarkers, Gleneagles Global Hospitals, Lakdikapul, Hyderabad-500004. Methodology: Antimicrobial drug sensitivity testing (AST) was performed on 72 clinical isolates of A. baumannii against two front-line antibiotics, Imipenem (10µg) and Meropenem (10µg), by Kirby-Bauer disk diffusion method. Production of long chain Acyl Homoserine lactone (AHLs) in the clinical isolates of A. baumannii was tested by cross streaking with the biosensor Chromobacterium violaceum mutant strain CV026 and Agrobacterium tumefaciens (NTL4pZLR4) by agar plate diffusion assay. Screening and identification of the quorum sensing mediator gene abaI was done by PCR to confirm its presence in all the 72 clinical isolates. Results: Out of the 72 clinical isolates, 58 were Carbapenem resistant Acinetobacter baumannii (CRAB) and 14 were Carbapenem sensitive Acinetobacter baumannii (CSAB) for AST by agar disc diffusion method. None of our isolates produced short chain AHLs whereas all the isolates could produce varying amounts of long chain AHLs. Genotypic confirmation of AHL gene was obtained by abaI gene PCR. Conclusion: Carbapenems are the front-line antibiotics used to treat gram negative bacterial infections in emergencies and in the critical care units of hospitals. Clinical isolates A. baumannii has innate resistance to several antibiotics due to various mechanisms, biofilms forming the first line of defense against antibiotics for the bacterium. Our study used AST to carbapenem as the leading marker for MDR, assuming the innate resistance of A. baumannii to other beta lactam antibiotics. Our study brought out certain important observations namely: a) All clinical isolates of A. baumannii produced Quorum Sensing signal molecules, the AHLs b) the clinical isolates of A. baumannii did not produce any short chain AHLs b) All the clinical isolates of A. baumannii produced long chain AHLs c) AHL production is not specific to carbapenem drug resistance because even CSAB isolates produced AHL d) AHL production is inherent to all clinical isolates of A. baumannii and it apparently indicates an underlying biofilm potential and MDR trait in these A. baumannii isolates. e) AHLs could be a universal marker for revealing MDR trait and biofilm potential in clinical microbiology AST profiling protocols.