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Al jebur AA, Soleimani N, Hosseini SM. Comparison of loop-mediated isothermal amplification, multiplex PCR, and REP- PCR techniques for identification of carbapenem-resistant Acinetobacter baumannii clinical isolates. IRANIAN JOURNAL OF MICROBIOLOGY 2023; 15:654-664. [PMID: 37941880 PMCID: PMC10628086 DOI: 10.18502/ijm.v15i5.13871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
Background and Objectives Acinetobacter baumannii, an opportunistic pathogen, is related to hospital-acquired infections and increased mortality. This study aimed to develop the loop-mediated isothermal amplification (LAMP) test for the fast-detecting of A. baumannii isolates as well as determining genetic relatedness for these isolates via the REP-PCR technique. Materials and Methods LAMP primers and multiplex PCR primers were designed for recognizing A. baumannii isolates harboring the bla SHV-1 , bla PER-1 , bla TEM-1, AMPC, qnr, and aac (6)-1 genes, were collected (October 2020 to February 2021) from Shahid Motahari Hospital, Tehran, Iran. Combination disc test (CDT) results were used to assess the phenotypic identification of isolates from ESBL producers. The sensitivity of the LAMP method was evaluated using a range of serial dilutions of genomic DNA. Results were compared between the LAMP technique, and multiplex PCR. The genetic diversity of clinical isolates was determined by REP-PCR. Results Among one hundred A. baumannii samples and based on the combined disc test, 56% of isolates were ESBL producers. The sensitivity of the LAMP technique for the identification of A. baumannii was 4.06 ng/μl whilst the multiplex PCR was (16.2 ng/μl). Regarding multiplex PCR, (68%) of the isolates were bla SHV-1 positive, (40%) bla PER-1, (85%) aac (6')-1, AMPC (67%), bla TEM-1 (63%), and (15%) qnr respectively. While in LAMP, (69%) of isolates were bla SHV-1 positive, (86%) aac (6')-1, and (20%) qnr. The results of AMPC, bla TEM-1 , and bla PER-1 genes showed 100% compatibility between multiplex PCR and LAMP assays. The results of REP-PCR indicated there were 17 clones, clone A at 14% was the most prevalent of the isolates. Conclusion Wherever equipment and financial constraints are crucial, the LAMP test offers a better and more potent detection rate for the identification of A. baumannii isolates than multiplex PCR. Furthermore, the genetic diversity of A. baumannii in these clinical isolates showed frequent commonality of genotypes.
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Affiliation(s)
- Aysar Abbood Al jebur
- Department of Microbiology and Microbial Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran
| | - Neda Soleimani
- Department of Microbiology and Microbial Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran
| | - Seyed Masoud Hosseini
- Department of Microbiology and Microbial Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran
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Ma C, Tian Z, Yang L, Cao J. Validation of qPCR from a crude extract for the rapid detection of white spot syndrome virus. AQUACULTURE INTERNATIONAL : JOURNAL OF THE EUROPEAN AQUACULTURE SOCIETY 2022; 30:2679-2690. [PMID: 35910332 PMCID: PMC9309450 DOI: 10.1007/s10499-022-00920-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 06/26/2022] [Indexed: 06/15/2023]
Abstract
UNLABELLED White spot disease (WSD) has posed a serious threat to the China and the global shrimp aquaculture. In order to diagnose white spot syndrome virus (WSSV) early and prevent the spread and outbreak of WSD, it is necessary to establish a highly sensitive WSSV diagnosis method suitable for shrimp farming sites. In this study, a pre-amplification qPCR assay from the crude extract of samples heated lysis was established, which was further compared with the universal qPCR assay to verify the shrimp samples. The limit of detection (LOD) of pre-amplification qPCR assay and universal qPCR assay was 2.80 copies and 20.57 copies per reaction at 95% CI, respectively. It had good WSSV specificity and did not show cross-detection of infectious hypodermal and hematopoietic necrosis virus (IHHNV), hepatopancreatic parvovirus (HPV), Enterocytozoon hepatopenaei (EHP), acute hepatopancreas necrosis disease (AHPND), necrotizing hepatopancreatitis bacteria (NHPB), and decapod iridescent virus 1 (DIV1). A total of 36 shrimp samples were detected as WSSV DNA positive by pre-amplification qPCR with crude extract from samples heated lysis and universal qPCR with DNA extraction. The diagnostic sensitivity and specificity were 97.22% (85.5 ~ 99.9%, 95% CI) and 100% (81.5 ~ 100%, 95% CI), respectively. The agreement Kappa value was 0.959 (0.879 ~ 1, 95% CI), and the analysis results were basically consistent. Eliminating the tedious steps of extracting DNA and using pre-amplified qPCR to detect WSSV in shrimp, it is a good choice for aquaculture farms. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s10499-022-00920-9.
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Affiliation(s)
- Chao Ma
- Key Laboratory of Biotechnology and Bioresources Utilization of Ministry of Education, Dalian Minzu University, Dalian, China
| | - Zhuo Tian
- Dalian Customs Technology Center, Dalian, China
| | - Lili Yang
- Key Laboratory of Biotechnology and Bioresources Utilization of Ministry of Education, Dalian Minzu University, Dalian, China
| | - Jijuan Cao
- Key Laboratory of Biotechnology and Bioresources Utilization of Ministry of Education, Dalian Minzu University, Dalian, China
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Vaez H, Kalarestaghi H, Sahebkar A, Khademi F. Prevalence of antibiotic resistance of Proteus species in urinary tract infections in Iran: A systematic review and meta-analysis. GENE REPORTS 2022. [DOI: 10.1016/j.genrep.2022.101632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ranjbar R, Mousavi A, Haghighat S. Integron Associated Antibiotic Resistance among Acinetobacter baumannii. IRANIAN JOURNAL OF PUBLIC HEALTH 2021; 50:1509-1510. [PMID: 34568198 PMCID: PMC8426767 DOI: 10.18502/ijph.v50i7.6652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 10/25/2019] [Indexed: 11/24/2022]
Abstract
The article’s abstract is not available.
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Affiliation(s)
- Reza Ranjbar
- Molecular Biology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Ali Mousavi
- Department of Microbiology, Faculty of Advanced Sciences & Technology, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran, Iran
| | - Setareh Haghighat
- Department of Microbiology, Faculty of Advanced Sciences & Technology, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran, Iran
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Zarabadi-Pour M, Peymani A, Habibollah-Pourzereshki N, Sarookhani MR, Karami AA, Javadi A. Detection of Extended-Spectrum β-Lactamases among Acinetobacter Baumannii Isolated from Hospitals of Qazvin, Iran. Ethiop J Health Sci 2021; 31:229-236. [PMID: 34158773 PMCID: PMC8188086 DOI: 10.4314/ejhs.v31i2.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background Acinetobacter baumannii is a major contributor to nosocomial infections. Extended-spectrum β-lactamase (ESBL)-producing A. baumannii is spreading worldwide. We aimed to determine the frequency of ESBL-encoding genes in clinical isolates of A. baumannii and to access their clonal relationship by repetitive extragenic palindromic-PCR (rep-PCR). Methods In this descriptive cross-sectional study, 203 isolates of A. baumannii were collected from Qazvin hospitals. The Identification of isolates was performed by standard laboratory methods. To verify ESBL production, all isolates were screened by disk agar diffusion and confirmed by the combined disk method. Subsequently, ESBL-encoding genes were detected by PCR and sequencing. Possible clonal association of ESBL-producing isolates was evaluated using rep-PCR. Results Two hundred (98.5%) isolates showed reduced susceptibility to one of the antibiotics used in the ESBL screening test, of which 127 isolates (62.6%) produced ESBL. PCR results showed blaOXA-1 (20.5%) was the most prevalent gene followed by blaTEM-1 (20%), blaGES-1 (15.7%), blaCTX-M-15 (7.9%), and blaPER-1 (1.6%). Rep-PCR results revealed that ESBL-producing isolates belonged to clones A (85%), B (13.4%), and C (1.6%). Conclusion Our study showed the significant presence of blaOXA-1, blaTEM-1, blaGES-1, blaCTX-M-15, and blaPER-1 genes in ESBL-producing A. baumannii isolates in the studied hospitals. This is the first report on the emergence of blaOXA-1 gene in these isolates in Iran. The use of comprehensive antimicrobial treatment guidelines based on laboratory data and appropriate infection control interventions are essential.
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Affiliation(s)
- Mina Zarabadi-Pour
- Student Research Committee, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Amir Peymani
- Medical Microbiology Research Center, Qazvin University of Medical Sciences, Qazvin, Iran
| | | | | | - Ali Akbar Karami
- Department of Urology, School of Medicine, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Amir Javadi
- Medical Microbiology Research Center, Qazvin University of Medical Sciences, Qazvin, Iran
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Ranjbar R, Zayeri S, Mirzaie A. Development of multiplex PCR for rapid detection of metallo-β-lactamase genes in clinical isolates of Acinetobacter baumannii. IRANIAN JOURNAL OF MICROBIOLOGY 2020; 12:107-112. [PMID: 32494344 PMCID: PMC7244819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
BACKGROUND AND OBJECTIVES Acinetobacter baumannii has been known as a major pathogen causing nosocomial infections. The aim of this study was to develop multiplex PCR for rapid and simultaneous detection of metallo-β-lactamase (MBL) genes in clinical isolates of A. baumannii. MATERIALS AND METHODS In this study, we used three sets of primers to amplify the MBL genes including bla OXA-48 , bla OXA-23 and bla NDM . The multiplex PCR assay was optimized for rapid and simultaneous detection of MBL genes in A. baumannii strains recovered from clinical samples. RESULTS A. baumannii strains recovered from clinical samples were subjected to the study. The multiplex PCR produced 3 bands of 501 bp for bla OXA-23 , 744 bp for bla OXA-48 and 623 bp for bla NDM genes. In addition to, no any cross-reactivity was observed in multiplex PCR. CONCLUSION Based on obtained data, the multiplex PCR had a good specificity without any cross reactivity and it appears that the multiplex PCR is reliable assay for simultaneous detection of MBL genes in A. baumannii strains.
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Affiliation(s)
- Reza Ranjbar
- Corresponding author: Reza Ranjbar, PhD, Molecular Biology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran., Tel: +98-21-88039883, Fax: +98-21-88039883,
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Ardehali S, Azimi T, Fallah F, Owrang M, Aghamohammadi N, Azimi L. Role of efflux pumps in reduced susceptibility to tigecycline in Acinetobacter baumannii. New Microbes New Infect 2019; 30:100547. [PMID: 31193724 PMCID: PMC6541740 DOI: 10.1016/j.nmni.2019.100547] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 03/04/2019] [Accepted: 04/02/2019] [Indexed: 12/15/2022] Open
Abstract
Acinetobacter baumannii is an important human pathogen responsible for a various type of infections. These bacterial strains are generally resistant to numerous antibiotics. Therefore, eradication of such strains is problematic and related to high mortality. We investigated the effect of cyanide 3-chlorophenylhydrazone (CCCP) efflux pump inhibitor in tigecycline-resistant strains of Acinetobacter baumannii. In a cross-sectional study, from July until the end of February 2017, eighty isolates of A. baumannii were recovered. Antimicrobial susceptibility testing against tigecycline was performed by the disc diffusion method and determination of minimum inhibitory concentration by broth microdilution method, according to Clinical and Laboratory Standards Institute guidelines. Active efflux pumps were detected by CCCP as an efflux pumps inhibitor, and the gene expression of some of the resistance/nodulation/division (RND)-type efflux pumps was measured by semiquantitative RT-PCR (qRT-PCR). Antibiotic susceptibility tests in this study showed that 78 of 80 A. baumannii isolates were resistant to tigecycline. The results of phenotypic detection of efflux pumps revealed that 23.07% of tigecycline-resistant A. baumannii isolates can contain active efflux pumps. On the basis of conventional PCR, genes coding for adeF and adeJ were detected in 76 (98%) A. baumannii isolates. The results of qRT-PCR showed that the transcript level of the adeJ gene increased in 66.6% A. baumannii isolates with CCCP-positive tests and was correlated with tigecycline resistance. The results of this study indicate that RND-type efflux pumps appear to play a significant role in the tigecycline resistance of A. baumannii.
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Affiliation(s)
- S.H. Ardehali
- Department of Anesthesiology and Critical Care, Shohadaye–Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - T. Azimi
- Department of Pathobiology, School of Public Health, Tehran, Iran
- Students' Scientific Research Center, Tehran University of Medical Sciences, Tehran, Iran
- Corresponding author. L. Azimi, Medical Bacteriology, Pediatric Infections Research Center, Research Institute for Children Health, Shahid Beheshti University of Medical Sciences, PO Box 15468-15514, Tehran, Iran.
| | - Fatemeh Fallah
- Pediatric Infection Research Center, Research Institute for Children Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - M. Owrang
- Faculty of Medicine, Sari Branch, Islamic Azad University, Sari, Iran
| | | | - L. Azimi
- Pediatric Infection Research Center, Research Institute for Children Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Ranjbar R, Zayeri S, Afshar D, Farshad S. Detection of OXA Beta Lactamases Among Clinical Isolates of Acinetobacter baumannii Isolated from Tehran Hospitals, Iran. Open Microbiol J 2019. [DOI: 10.2174/1874285801913010068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Background and Objective:Acinetobacter baumanniiis a non-motile Gram-negative bacterial pathogen with the history of vast resistant to antibiotics. The aim of this study was to determine the possibility of existence of OXAs genes among clinical isolates ofA. baumanniiobtained from Tehran hospitals.Materials and Methods:A total of 101 isolates were identified asA. baumanniiby common biochemical and molecular tests. The susceptibility to different antibiotics was assessed with Kirby-Bauer disk diffusion method. Phenotypic Detection of MBLs was performed with CDT test and PCR assay was also performed for detection ofblaOXA-23-like,blaOXA-24-like,blaOXA-40-like,blaOXA-51-like,blaOXA-58-likeandblaOXA-143-likegenesResults:All isolates ofA. baumanniishowed high-level of resistance to all antibiotics except for Polymyxin B. TheblaOXA-51 likegenes was found in all of the isolates and the prevalence ofblaOXA-143like,blaOXA-23like,blaOXA-40likeandblaOXA-24likewere 56%, 45.45%, 33% and 11.8%, respectively.Conclusion:TheblaOXA-51-likewas the predominant mechanism of resistance to imipenem inA. baumanniiand therefore, early recognition of carbapenem-resistantA. baumanniiisolates is a useful tools to prevent their spreading within the hospital environment.
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