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Biglari S, Hanafiah A, Mohd Puzi S, Ramli R, Rahman M, Lopes BS. Antimicrobial Resistance Mechanisms and Genetic Diversity of Multidrug-Resistant Acinetobacter baumannii Isolated from a Teaching Hospital in Malaysia. Microb Drug Resist 2016; 23:545-555. [PMID: 27854165 DOI: 10.1089/mdr.2016.0130] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Multidrug-resistant (MDR) Acinetobacter baumannii has increasingly emerged as an important nosocomial pathogen. The aim of this study was to determine the resistance profiles and genetic diversity in A. baumannii clinical isolates in a tertiary medical center in Malaysia. The minimum inhibitory concentrations of carbapenems (imipenem and meropenem), cephalosporins (ceftazidime and cefepime), and ciprofloxacin were determined by E-test. PCR and sequencing were carried out for the detection of antibiotic resistance genes and mutations. Clonal relatedness among A. baumannii isolates was determined by REP-PCR. Sequence-based typing of OXA-51 and multilocus sequence typing were performed. One hundred twenty-five of 162 (77.2%) A. baumannii isolates had MDR phenotype. From the 162 A. baumannii isolates, 20 strain types were identified and majority of A. baumannii isolates (66%, n = 107) were classified as strain type 1 and were positive for ISAba1-blaOXA-23 and ISAba1-blaADC and had mutations in both gyrA and parC genes at positions, 83 and 80, resulting in serine-to-leucine conversion. REP-PCR analysis showed 129 REP types that generated 31 clones with a 90% similarity cutoff value. OXA-66 variant of the blaOXA-51-like genes was predominantly detected among our A. baumannii clinical isolates belonging to ST195 (found in six clones: 1, 8, 9, 19, 27, and 30) and ST208 (found in clone 21). The study helps us in understanding the genetic diversity of A. baumannii isolates in our setting and confirms that international clone II is the most widely distributed clone in Universiti Kebangsaan Malaysia Medical Centre, Malaysia.
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Affiliation(s)
- Shirin Biglari
- 1 Department of Medical Microbiology and Immunology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre , Kuala Lumpur, Malaysia
| | - Alfizah Hanafiah
- 1 Department of Medical Microbiology and Immunology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre , Kuala Lumpur, Malaysia
| | - Shaliawani Mohd Puzi
- 1 Department of Medical Microbiology and Immunology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre , Kuala Lumpur, Malaysia
| | - Ramliza Ramli
- 1 Department of Medical Microbiology and Immunology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre , Kuala Lumpur, Malaysia
| | - Mostafizur Rahman
- 1 Department of Medical Microbiology and Immunology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre , Kuala Lumpur, Malaysia
| | - Bruno Silvester Lopes
- 2 Department of Medical Microbiology, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen , Aberdeen, United Kingdom
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Lim J, Lee G, Choi Y, Kim J. An Analysis of the Antibiotic Resistance Genes of Multi-Drug Resistant (MDR) Acinetobacter baumannii. KOREAN JOURNAL OF CLINICAL LABORATORY SCIENCE 2016. [DOI: 10.15324/kjcls.2016.48.3.217] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Jina Lim
- Department of Biomedical Laboratory Science, Yonsei University, Wonju 26493, Korea
| | - Gyusang Lee
- MAKRI (Military National Defense) KIA Recovery and Identification), Department of Identification, Scientific Staff, Seoul 06984, Korea
| | - Yeonim Choi
- Department of Biomedical Laboratory Science, Songho College, Hoengseong 25242, Korea
| | - Jongbae Kim
- Department of Biomedical Laboratory Science, Yonsei University, Wonju 26493, Korea
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Teo J, Lim TP, Hsu LY, Tan TY, Sasikala S, Hon PY, Kwa AL, Apisarnthanarak A. Extensively drug-resistant Acinetobacter baumannii in a Thai hospital: a molecular epidemiologic analysis and identification of bactericidal Polymyxin B-based combinations. Antimicrob Resist Infect Control 2015; 4:2. [PMID: 25648393 PMCID: PMC4314787 DOI: 10.1186/s13756-015-0043-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 01/09/2015] [Indexed: 11/22/2022] Open
Abstract
Background Limited knowledge of the local molecular epidemiology and the paucity of new effective antibiotics has resulted in an immense challenge in the control and treatment of extensively drug-resistant (XDR) Acinetobacter baumannii infections in Thailand. Antimicrobial combination regimens may be the only feasible treatment option in such cases. We sought to characterize the local molecular epidemiology and assess the bactericidal activity of various antibiotics individually and in combination against XDR A. baumannii in a Thai hospital. Methods All XDR A. baumannii isolates from Thammasat University Hospital were collected between October 2010 and May 2011. Susceptibility testing was conducted according to reference broth dilution methods. Pulse-field gel electrophoresis was used to genotype the isolates. Carbapenemase genes were detected using polymerase chain reaction. In vitro testing of clinically-relevant concentrations of imipenem, meropenem, doripenem, rifampicin and tigecycline alone and in combination with polymyxin B was conducted using multiple combination bactericidal testing. Results Forty-nine polymyxin B-susceptible XDR A. baumannii isolates were identified. blaOXA-23 and blaOXA-51 genes were detected in all isolates. Eight clonally related clusters were identified, resulting in the initiation of several infection control measures. Imipenem, meropenem, doripenem, rifampicin, and tigecycline in combination with PB respectively, exhibited bactericidal killing in 100%, 100%, 98.0%, 100% and 87.8% isolates respectively at 24 hours. Conclusion Molecular epidemiologic analysis can aid the early detection of infection outbreak within the institution, resulting in the rapid containment of the outbreak. Imipenem/meropenem/rifampicin in combination with polymyxin B demonstrated consistent bactericidal effect against 49 blaOXA-23-harbouring XDR A. baumannii clinical isolates, suggesting a role of combination therapy in the treatment of these infections.
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Affiliation(s)
- Jocelyn Teo
- Department of Pharmacy, Singapore General Hospital, Outram Road, Singapore, 169608 Singapore
| | - Tze-Peng Lim
- Department of Pharmacy, Singapore General Hospital, Outram Road, Singapore, 169608 Singapore.,Division of Infectious Diseases, Department of Medicine, 1E Kent Ridge Road, NUHS, Yong Loo Lin School of Medicine, National University of Singapore, Tower Block, Level 9, Singapore, 119228 Singapore
| | - Li-Yang Hsu
- Division of Infectious Diseases, Department of Medicine, 1E Kent Ridge Road, NUHS, Yong Loo Lin School of Medicine, National University of Singapore, Tower Block, Level 9, Singapore, 119228 Singapore
| | - Thean-Yen Tan
- Department of Laboratory Medicine, Changi General Hospital, 2 Simei St 3, Singapore, 529889 Singapore
| | - Suranthran Sasikala
- Department of Pharmacy, Singapore General Hospital, Outram Road, Singapore, 169608 Singapore.,Current address: AStar, Biopolis, 31 Biopolis Way, Singapore, 138668 Singapore
| | - Pei-Yun Hon
- Division of Infectious Diseases, Department of Medicine, 1E Kent Ridge Road, NUHS, Yong Loo Lin School of Medicine, National University of Singapore, Tower Block, Level 9, Singapore, 119228 Singapore.,Current address: Tan Tock Seng Hospital, 11 Jalan Tan Tock Seng, Singapore, 308433 Singapore
| | - Andrea L Kwa
- Department of Pharmacy, Singapore General Hospital, Outram Road, Singapore, 169608 Singapore.,Emerging Infectious Diseases, Duke-NUS Graduate Medical School, Singapore, 169857 Singapore
| | - Anucha Apisarnthanarak
- Division of Infectious Diseases, Faculty of Medicine, Thammasat University Hospital, Pathumthani, 12120 Thailand
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Jang IH, Park SD, Uh Y, Lee GS, Kim JB, Choi I. Molecular Characteristics of blaOXA-23-Producing Acinetobacter baumanniiIsolated from a University Hospital. ANNALS OF CLINICAL MICROBIOLOGY 2013. [DOI: 10.5145/acm.2013.16.3.126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- In-Ho Jang
- Department of Laboratory Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Soon Deok Park
- Department of Laboratory Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Young Uh
- Department of Laboratory Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Gyu-sang Lee
- Department of Biomedical Laboratory Science, College of Health Science, Yonsei University, Wonju, Korea
| | - Jong-Bae Kim
- Department of Biomedical Laboratory Science, College of Health Science, Yonsei University, Wonju, Korea
| | - Il Choi
- Department of Animal Science and Technology, College of Life Science and Natural Resources, Sangi University, Wonju, Korea
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