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Zhang CL, Wang C, Dong YS, Sun YQ, Xiu ZL. Dynamic immobilization of bacterial cells on biofilm in a polyester nonwoven chemostat. BIORESOUR BIOPROCESS 2024; 11:17. [PMID: 38647810 PMCID: PMC10992621 DOI: 10.1186/s40643-024-00732-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Accepted: 01/12/2024] [Indexed: 04/25/2024] Open
Abstract
Cell immobilization plays an important role in biocatalysis for high-value products. It is necessary to maintain the viability of immobilized cells for bioconversion using viable cells as biocatalysts. In this study, a novel polyester nonwoven chemostat was designed for cell immobilization to investigate biofilm formation and the dynamic balance between adsorption and desorption of cells on polyester nonwoven. The polyester nonwoven was suitable for cell immobilization, and the cell numbers on the polyester nonwoven can reach 6.5 ± 0.38 log CFU/mL. After adding the polyester nonwoven to the chemostat, the fluctuation phenomenon of free bacterial cells occurred. The reason for this phenomenon was the balance between adsorption and desorption of bacterial cells on the polyester nonwoven. Bacterial cells could adhere to the surface of polyester nonwoven via secreting extracellular polymeric substances (EPS) to form biofilms. As the maturation of biofilms, some dead cells inside the biofilms can cause the detachment of biofilms. This process of continuous adsorption and desorption of cells can ensure that the polyester nonwoven chemostat has lasting biological activity.
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Affiliation(s)
- Chao-Lei Zhang
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024, People's Republic of China
- Public Security Management Department, Liaoning Police College, Yingping Road 260, Dalian, 116024, People's Republic of China
| | - Chao Wang
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510006, People's Republic of China
| | - Yue-Sheng Dong
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024, People's Republic of China
| | - Ya-Qin Sun
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024, People's Republic of China
| | - Zhi-Long Xiu
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024, People's Republic of China.
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Hassan MM, Albogami B, Mwabvu T, Awad MF, Kadi RH, Mohamed AA, Al-Orabi JA, Hassan MM, Elsharkawy MM. The Antibacterial Activity of Rhazya stricta Extracts against Klebsiella pneumoniae Isolated from Some Soil Invertebrates at High Altitudes. Molecules 2023; 28:molecules28083613. [PMID: 37110847 PMCID: PMC10142056 DOI: 10.3390/molecules28083613] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 04/09/2023] [Accepted: 04/18/2023] [Indexed: 04/29/2023] Open
Abstract
Klebsiella is a common dangerous pathogen for humans and animals and is widely present in the digestive system. The genus Klebsiella is ubiquitous, as it is endemic to surface water, soil, and sewage. In this study, 70 samples were obtained from soil-dwelling invertebrates from September 2021 to March 2022 from Taif and Shafa in different altitudinal regions of Saudi Arabia. Fifteen of these samples were identified as Klebsiella spp. The Klebsiella isolates were genetically identified as Klebsiella pneumoniae using rDNA sequencing. The antimicrobial susceptibility of the Klebsiella isolates was determined. Amplification of virulence genes was performed using PCR. In this study, 16S rDNA sequencing showed a similarity from 98% to 100% with related K. pneumonia from the NCBI database, and the sequences were deposited in the NCBI GenBank under accession numbers ON077036 to ON077050. The growth inhibition properties of ethanolic and methanolic extracts of the medicinal plant Rhazya stricta's leaves against K. pneumoniae strains using the minimum inhibitory concentration (MIC) method and disc diffusion were evaluated. In addition, the biofilm inhibitory potential of these extracts was investigated using crystal violet. HPLC analysis identified 19 components divided into 6 flavonoids, 11 phenolic acids, stilbene (resveratrol), and quinol, and revealed variations in the number of components and their quantities between extracts. Both extracts demonstrated interesting antibacterial properties against K. pneumoniae isolates. The 2 extracts also showed strong biofilm inhibitory activities, with percentages of inhibition extending from 81.5% to 98.7% and from 35.1% to 85.8% for the ethanolic and methanolic extracts, respectively. Rhazya stricta leaf extract revealed powerful antibacterial and antibiofilm activities against K. pneumoniae isolates and could be a good candidate for the treatment or prevention of K. pneumonia-related infections.
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Affiliation(s)
- Mohamed M Hassan
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
- High Altitude Research Centre, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Bander Albogami
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
- High Altitude Research Centre, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Tarombera Mwabvu
- School of Biology & Environmental Sciences, University of Mpumalanga, Private Bag X 11283, Mbombela 1200, South Africa
| | - Mohamed F Awad
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
- High Altitude Research Centre, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Roqayah H Kadi
- Department of Biology, Faculty of Science, University of Jeddah, Jeddah 21959, Saudi Arabia
| | - Alaa A Mohamed
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
- High Altitude Research Centre, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Jamal A Al-Orabi
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
- High Altitude Research Centre, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Montaser M Hassan
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
- High Altitude Research Centre, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Mohsen Mohamed Elsharkawy
- Department of Agricultural Botany, Faculty of Agriculture, Kafrelsheikh University, Kafr Elsheikh 33516, Egypt
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3
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Feng X, Zhou D, Xie G, Liu J, Xiong Q, Xu H. A novel photoreactive DNA-binding dye for detecting viable Klebsiella pneumoniae in powdered infant formula. J Dairy Sci 2022; 105:4895-4902. [PMID: 35450718 DOI: 10.3168/jds.2022-21900] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Accepted: 02/23/2022] [Indexed: 11/19/2022]
Abstract
In addition to Cronobacter spp., Klebsiella pneumoniae is another opportunistic bacterial pathogen present in powdered infant formula (PIF) that can cause pneumonia, septicemia, and other diseases. In this study, a rapid and specific method based on a fluorescence probe was developed for detecting viable K. pneumoniae in PIF samples via the combination of recombinase-aided amplification (RAA) with thiazole orange monoazide (TOMA) dye (the TOMA-RAA assay hereafter). As a novel photosensitive DNA-intercalating dye, TOMA was used to penetrate bacterial cells, including both dead and viable cells, as verified by confocal laser scanning microscopy and fluorescent emission spectrometry. Importantly, the RAA assay exhibited good performance in detecting K. pneumoniae within 40 min at 39°C. Under optimal conditions, the TOMA-RAA assay can detect as low as 2.6 × 103 cfu/mL of K. pneumoniae in pure culture and 2.3 × 104 cfu/g of K. pneumoniae in spiked PIF sample. After 3 h of pre-enrichment, 3 × 100 cfu/g of K. pneumoniae can be detected. Furthermore, the TOMA-RAA assay displayed an excellent anti-interference ability to nontarget bacteria. In short, the proposed method has great potential application for the rapid and accurate detection of viable K. pneumoniae in PIF.
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Affiliation(s)
- Xiaoyan Feng
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, P.R. China
| | - Donggen Zhou
- Ningbo International Travel Healthcare Center (Ningbo Customs Port Outpatient Department), Ningbo, 315010, P.R. China
| | - Guoyang Xie
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, P.R. China
| | - Ju Liu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, P.R. China
| | - Qin Xiong
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, P.R. China
| | - Hengyi Xu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, P.R. China.
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Sivaraman GK, Sudha S, Muneeb KH, Shome B, Holmes M, Cole J. Molecular assessment of antimicrobial resistance and virulence in multi drug resistant ESBL-producing Escherichia coli and Klebsiella pneumoniae from food fishes, Assam, India. Microb Pathog 2020; 149:104581. [PMID: 33080358 DOI: 10.1016/j.micpath.2020.104581] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 10/13/2020] [Accepted: 10/14/2020] [Indexed: 02/06/2023]
Abstract
The present study investigated the prevalence of Extended-Spectrum Beta Lactamase (ESBL) -producing E. coli and K. pneumoniae from the food fishes in retail markets in Assam, India. A total of 54 ESBL-producing E. coli and 12 K. pneumoniae isolates were recovered from 79 fish samples and were analyzed for antimicrobial resistance genes (ARGs) and virulence genes. E. coli isolates were categorized as multi drug resistant with resistance up to 12 different antibiotics with multiple antibiotic resistances (MAR) index ranging from 0.26 to 0.63. In E. coli, 100% resistance to cefotaxime along with 6% resistance to ceftazidime (third-generation cephalosporins) was observed. Moreover, 85% of the E. coli isolates were resistant to cefepime, a fourth-generation cephalosporin. K. pneumoniae showed resistance to 11 different antibiotics with MAR index value ranging from 0.21 to 0.57. All K. pneumoniae isolates showed 100% resistance to cefotaxime, 67% resistance to ceftazidime and 75% resistance to cefepime. Molecular characterization of ARGs revealed the presence of CTX-M group 1(CTX-M-15) in almost all E. coli isolates (98%, n = 53) and 100% in K. pneumoniae. A combination of uniplex and multiplex PCRs revealed fewer ARGs in E. coli isolates, with each isolate carrying 3 to 5 genes (tetA, dfrA1, sul1, sul2, qnrB, qnrS, aac(6')-Ib-cr). Majority of the E. coli were assigned to low-virulence phylogroup B1 and A while 8% of them belonged to pathogenic phylogroup D. 31 unique genetic profiles were identified for E. coli isolates by Pulsed-Field Gel Electrophoresis (PFGE) typing. K. pneumoniae isolates were highly diverse with 11 unique genetic profiles and a substantial ARG profile (blaTEM, blaSHV, blaOXA-1-like, tetA, strA, strB, dfrA1, sul1, sul2, qnrB, qnrS, aac(6')-Ib-cr, oqxA, oqxB). The frequency of ARGs ranged between 4 and 11. All K. pneumoniae isolates belonged to capsular serotype with wzi gene. Virulence gene iutA was prominent in all isolates while ybtS and kfu were confirmed in two isolates. Our findings raise concerns that fishes bought for consumption may serve as potential reservoirs of AMR genes and pose serious threat to public health. The study emphasizes the need for extensive surveillance of resistant strains in aquaculture and related settings, their in-depth analysis of population structure and transmission dynamics.
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Affiliation(s)
- G K Sivaraman
- Microbiology Fermentation and Biotechnology Division, ICAR-Central Institute of Fisheries Technology, Kochi, India.
| | - S Sudha
- Microbiology Fermentation and Biotechnology Division, ICAR-Central Institute of Fisheries Technology, Kochi, India
| | - K H Muneeb
- Microbiology Fermentation and Biotechnology Division, ICAR-Central Institute of Fisheries Technology, Kochi, India
| | - Bibek Shome
- Department of Disease Investigation, ICAR-National Institute of Veterinary Epidemiology and Disease Informatics, Bangalore, India
| | - Mark Holmes
- Department of Veterinary Medicine, University of Cambridge, UK
| | - Jennifer Cole
- Department of Geography, Royal Holloway, University of London, UK.PhD Principal Scientist & Principal Investigator, Microbiology Fermentation and Biotechnology Division ICAR-Central Institute of Fisheries Technology, Matsyapuri P. O, Willingdon Island Kochi, 682 029, India
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5
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Vakili B, Fateh A, Asadzadeh Aghdaei H, Sotoodehnejadnematalahi F, Siadat SD. Characterization of Gut Microbiota in Hospitalized Patients with Clostridioides difficile Infection. Curr Microbiol 2020; 77:1673-1680. [PMID: 32296918 DOI: 10.1007/s00284-020-01980-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 04/04/2020] [Indexed: 12/28/2022]
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6
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Cong J, Zhu H, Liu D, Li T, Zhang C, Zhu J, Lv H, Liu K, Hao C, Tian Z, Zhang J, Zhang X. A Pilot Study: Changes of Gut Microbiota in Post-surgery Colorectal Cancer Patients. Front Microbiol 2018; 9:2777. [PMID: 30515141 PMCID: PMC6255893 DOI: 10.3389/fmicb.2018.02777] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 10/30/2018] [Indexed: 01/26/2023] Open
Abstract
Colorectal cancer (CRC) is a growing health problem throughout the world. Strong evidences have supported that gut microbiota can influence tumorigenesis; however, little is known about what happens to gut microbiota following surgical resection. Here, we examined the changes of gut microbiota in CRC patients after the surgical resection. Using the PCoA analysis and dissimilarity tests, the microbial taxonomic compositions and diversities of gut microbiota in post-surgery CRC patients (A1) were significantly different from those in pre-surgery CRC patients (A0) and healthy individuals (H). Compared with A0 and H, the Shannon diversity and Simpson diversity were significantly decreased in A1 (P < 0.05). Based on the LEfSe analysis, the relative abundance of phylum Proteobacteria in A1 was significantly increased than that in A0 and H. The genus Klebsiella in A1 had higher proportions than that in A0 (P < 0.05). Individual variation was distinct; however, 90% of CRC patients in A1 had more abundances of Klebsiella than A0. The Klebsiella in A1 was significantly associated with infectious diseases (P < 0.05), revealed by the correlation analysis between differentiated genera and metabolic pathway. The Klebsiella (Proteobacteria, Gammaproteobacteria, Enterobacteriales, Enterobacteriaceae) in A1 was significantly linked with lymphatic invasion (P < 0.05). Furthermore, the PCA of KEGG pathways indicated that gut microbiota with a more scattered distribution in A1 was noticeably different from that in A0 and H. The nodes, the links, and the kinds of phylum in each module in A1 were less than those in A0 and H, indicating that gut microbiota in A1 had a relatively looser ecologcial interaction network. To sum up, this pilot study identified the changes of gut microbiota in post-surgery CRC patients, and highlights future avenues in which the gut microbiota is likely to be of increasing importance in the care of surgical patients.
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Affiliation(s)
- Jing Cong
- Department of Medical Oncology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China.,Qingdao Cancer Institute, Qingdao, China
| | - Hua Zhu
- Department of Medical Oncology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Dong Liu
- Department of Medical Oncology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China.,Qingdao Cancer Institute, Qingdao, China
| | - Tianjun Li
- Department of Medical Oncology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Chuantao Zhang
- Department of Medical Oncology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Jingjuan Zhu
- Department of Medical Oncology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Hongying Lv
- Department of Medical Oncology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Kewei Liu
- Department of Medical Oncology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Chenxing Hao
- Department of Medical Oncology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Zibin Tian
- Department of Gastroenterology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Jianli Zhang
- Department of General Surgery, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Xiaochun Zhang
- Department of Medical Oncology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China.,Qingdao Cancer Institute, Qingdao, China
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7
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Rapid, sensitive and reliable detection of Klebsiella pneumoniae by label-free multiple cross displacement amplification coupled with nanoparticles-based biosensor. J Microbiol Methods 2018; 149:80-88. [PMID: 29730325 DOI: 10.1016/j.mimet.2018.05.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 03/22/2018] [Accepted: 05/02/2018] [Indexed: 02/07/2023]
Abstract
Klebsiella pneumoniae (K. pneumoniae), as an important hospital-acquired bacterium, is responsible for severe morbidity and mortality among the elderly, newborn and immune-compromised people. We established a rcsA gene-based label-free multiple cross displacement amplification (MCDA) assay for rapid, simple and sensitive detection of K. pneumoniae by using lateral flow biosensor (LFB). MCDA reaction was conducted at a fixed temperature (65 °C) for only 30 min, and amplification results were directly indicated using LFB. The results showed that reaction products were detectable from as little as 100 fg and 4.8 CFU of pure K. pneumoniae templates, and from approximately 480 CFU in 1 mL of spiked clinical samples. All K. pneumoniae strains examined were positive for label-free MCDA-LFB analysis, and all non-K. pneumoniae strains used in the report were negative for label-free MCDA-LFB assay, indicating the high selectivity of the label free MCDA-LFB assay. Furthermore, to remove false-positive results, the label-free MCDA-LFB assay was supplemented with antarctic thermal sensitive uracil-DNA-glycosylase (AUDG) to eliminate the carryover contamination. Thus, label-free MCDA-LFB assay complemented with AUDG enzyme was a rapid, simple, sensitive and reliable technique for detection of target pathogen, which has the ability to effectively avoid carryover contamination, and can be a valuable tool for "on-site" detection, clinical diagnosis, and primary quarantine purposes.
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Zhang S, Yang G, Ye Q, Wu Q, Zhang J, Huang Y. Phenotypic and Genotypic Characterization of Klebsiella pneumoniae Isolated From Retail Foods in China. Front Microbiol 2018; 9:289. [PMID: 29545778 PMCID: PMC5839057 DOI: 10.3389/fmicb.2018.00289] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Accepted: 02/07/2018] [Indexed: 02/02/2023] Open
Abstract
Klebsiella pneumoniae is not only a major hospital-acquired pathogen but also an important food-borne pathogen that can cause septicaemia, liver abscesses, and diarrhea in humans. The phenotypic and genotypic characteristics of K. pneumoniae in retail foods have not been thoroughly investigated in China. The objective of this study was to characterize K. pneumoniae isolates through biotyping, serotyping, determination of virulence factors, antibiotic resistance testing, enterobacterial repetitive intergenic consensus-polymerase chain reaction (ERIC-PCR), and (GTG)5-PCR molecular typing. From May 2013 to April 2014, a total of 61 K. pneumoniae isolates were collected from retail foods in China. Using API 20E test strips, five different biotype profiles were identified among these isolates. The majority of isolates belonged to biochemical profile “5215773” (50 isolates, 80.6%). The capsular serotypes of the 61 K. pneumoniae isolates and one reference strain were determined by PCR. Of the seven capsular serotypes tested, four different capsular serotypes were identified. Serotypes K1, K20, K57, and K2 were detected in two, three, two, and one isolates, respectively. Serotypes K3, K5, and K54 were not detected. The presence of 11 virulence genes was assessed by PCR. The most common virulence genes were fimH (85.5%), ureA (79.0%), wabG (77.4%), uge (56.5%), and kfuBC (29.0%). ERIC-PCR and (GTG)5-PCR molecular typing indicated high genetic diversity among K. pneumoniae isolates. We identified 60 different ERIC patterns and 56 distinct (GTG)5 patterns. Genotypic results indicated that isolates carrying similar virulence factors were generally genetically related. Some isolates from the same geographic area have a closer relationship. The isolates showed high levels of resistance to ampicillin (51/62, 82.2%). Resistance to streptomycin (11/62, 17.7%) and piperacillin (10/62, 16.1%) was also common. The presence of virulent and antibiotic-resistant K. pneumoniae in foods poses a potential health hazard for consumers. Our findings highlight the importance of surveillance of K. pneumoniae in foods.
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Affiliation(s)
- Shuhong Zhang
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Open Laboratory of Applied Microbiology, Guangdong Institute of Microbiology, Guangzhou, China.,College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
| | - Guangzhu Yang
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Open Laboratory of Applied Microbiology, Guangdong Institute of Microbiology, Guangzhou, China
| | - Qinghua Ye
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Open Laboratory of Applied Microbiology, Guangdong Institute of Microbiology, Guangzhou, China
| | - Qingping Wu
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Open Laboratory of Applied Microbiology, Guangdong Institute of Microbiology, Guangzhou, China
| | - Jumei Zhang
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Open Laboratory of Applied Microbiology, Guangdong Institute of Microbiology, Guangzhou, China
| | - Yuanbin Huang
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Open Laboratory of Applied Microbiology, Guangdong Institute of Microbiology, Guangzhou, China
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9
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Gautam RK, Nagar V, Shashidhar R. Effect of radiation processing in elimination of Klebsiella pneumoniae from food. Radiat Phys Chem Oxf Engl 1993 2015. [DOI: 10.1016/j.radphyschem.2015.06.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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10
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Real-Time TaqMan PCR for Rapid Detection and Quantification of Coliforms in Chilled Meat. FOOD ANAL METHOD 2015. [DOI: 10.1007/s12161-015-0271-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Dong D, Liu W, Li H, Wang Y, Li X, Zou D, Yang Z, Huang S, Zhou D, Huang L, Yuan J. Survey and rapid detection of Klebsiella pneumoniae in clinical samples targeting the rcsA gene in Beijing, China. Front Microbiol 2015; 6:519. [PMID: 26052327 PMCID: PMC4440914 DOI: 10.3389/fmicb.2015.00519] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 05/09/2015] [Indexed: 12/28/2022] Open
Abstract
Klebsiella pneumoniae is a wide-spread nosocomial pathogen. A rapid and sensitive molecular method for the detection of K. pneumoniae in clinical samples is needed to guide therapeutic treatment. In this study, we first described a loop-mediated isothermal amplification (LAMP) method for the rapid detection of capsular polysaccharide synthesis regulating gene rcsA from K. pneumoniaein clinical samples by using two methods including real-time turbidity monitoring and fluorescence detection to assess the reaction. Then dissemination of K. pneumoniae strains was investigated from ICU patients in three top hospitals in Beijing, China. The results showed that the detection limit of the LAMP method was 0.115 pg/μl DNA within 60 min under isothermal conditions (61°C), a 100-fold increase in sensitivity compared with conventional PCR. All 30 non- K. pneumoniae strains tested were negative for LAMP detection, indicating the high specificity of the LAMP reaction. To evaluate the application of the LAMP assay to clinical diagnosis, of 110 clinical sputum samples collected from ICU patients with clinically suspected multi-resistant infections in China, a total of 32 K. pneumoniae isolates were identified for LAMP-based surveillance of rcsA. All isolates belonged to nine different K. pneumoniae multilocus sequence typing (MLST) groups. Strikingly, of the 32 K. pneumoniae strains, 18 contained the Klebsiella pneumoniae Carbapenemase (KPC)-encoding gene blaKPC-2 and had high resistance to β-lactam antibiotics. Moreover, K. pneumoniae WJ-64 was discovered to contain blaKPC-2 and blaNDM-1genes simultaneously in the isolate. Our data showed the high prevalence of blaKPC-2 among K. pneumoniae and co-occurrence of many resistant genes in the clinical strains signal a rapid and continuing evolution of K. pneumoniae. In conclusion, we have developed a rapid and sensitive visual K. pneumoniae detection LAMP assay, which could be a useful tool for clinical screening, on-site diagnosis and primary quarantine purposes.
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Affiliation(s)
- Derong Dong
- Institute of Disease Control and Prevention, Academy of Military Medical Sciences Beijing, China
| | - Wei Liu
- Institute of Disease Control and Prevention, Academy of Military Medical Sciences Beijing, China
| | - Huan Li
- Institute of Disease Control and Prevention, Academy of Military Medical Sciences Beijing, China
| | - Yufei Wang
- Department of Laboratory Medicine, The General Hospital of Chinese People's Armed Police Forces Beijing, China
| | - Xinran Li
- Institute of Disease Control and Prevention, Academy of Military Medical Sciences Beijing, China
| | - Dayang Zou
- Institute of Disease Control and Prevention, Academy of Military Medical Sciences Beijing, China
| | - Zhan Yang
- Institute of Disease Control and Prevention, Academy of Military Medical Sciences Beijing, China
| | - Simo Huang
- Institute of Disease Control and Prevention, Academy of Military Medical Sciences Beijing, China
| | - Dongsheng Zhou
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology Beijing, China
| | - Liuyu Huang
- Institute of Disease Control and Prevention, Academy of Military Medical Sciences Beijing, China
| | - Jing Yuan
- Institute of Disease Control and Prevention, Academy of Military Medical Sciences Beijing, China
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12
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Lu X, Zhang XX, Wang Z, Huang K, Wang Y, Liang W, Tan Y, Liu B, Tang J. Bacterial pathogens and community composition in advanced sewage treatment systems revealed by metagenomics analysis based on high-throughput sequencing. PLoS One 2015; 10:e0125549. [PMID: 25938416 PMCID: PMC4418606 DOI: 10.1371/journal.pone.0125549] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 03/25/2015] [Indexed: 12/15/2022] Open
Abstract
This study used 454 pyrosequencing, Illumina high-throughput sequencing and metagenomic analysis to investigate bacterial pathogens and their potential virulence in a sewage treatment plant (STP) applying both conventional and advanced treatment processes. Pyrosequencing and Illumina sequencing consistently demonstrated that Arcobacter genus occupied over 43.42% of total abundance of potential pathogens in the STP. At species level, potential pathogens Arcobacter butzleri, Aeromonas hydrophila and Klebsiella pneumonia dominated in raw sewage, which was also confirmed by quantitative real time PCR. Illumina sequencing also revealed prevalence of various types of pathogenicity islands and virulence proteins in the STP. Most of the potential pathogens and virulence factors were eliminated in the STP, and the removal efficiency mainly depended on oxidation ditch. Compared with sand filtration, magnetic resin seemed to have higher removals in most of the potential pathogens and virulence factors. However, presence of the residual A. butzleri in the final effluent still deserves more concerns. The findings indicate that sewage acts as an important source of environmental pathogens, but STPs can effectively control their spread in the environment. Joint use of the high-throughput sequencing technologies is considered a reliable method for deep and comprehensive overview of environmental bacterial virulence.
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Affiliation(s)
- Xin Lu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China
| | - Xu-Xiang Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China
- * E-mail: (XXZ); (BL)
| | - Zhu Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China
| | - Kailong Huang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China
| | - Yuan Wang
- Environmental Science Research Institute of Jiangsu, Nanjing, China
| | - Weigang Liang
- Zhengzhou Sewage Purification Company, Zhengzhou, China
| | - Yunfei Tan
- Zhengzhou Sewage Purification Company, Zhengzhou, China
| | - Bo Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China
- Research Institute of Nanjing University at Lianyungang, Lianyungang, China
- * E-mail: (XXZ); (BL)
| | - Junying Tang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China
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Handley JA, Shi Z, Park SH, Dawoud TM, Kwon YM, Ricke SC. Salmonella and the Potential Role for Methods to Develop Microbial Process Indicators on Chicken Carcasses. Food Saf (Tokyo) 2015. [DOI: 10.1016/b978-0-12-800245-2.00006-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Saxer S, Schwenninger SM, Lacroix C. Characterization of the microflora of industrial Mexican cheeses produced without added chemical preservatives. Lebensm Wiss Technol 2013. [DOI: 10.1016/j.lwt.2013.01.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Zhang Q, Chen T, Yang S, Wang X, Guo H. Response surface methodology to design a selective enrichment broth for rapid detection of Salmonella spp. by SYBR Green Ι real-time PCR. Appl Microbiol Biotechnol 2013; 97:4149-58. [DOI: 10.1007/s00253-013-4780-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2012] [Revised: 02/14/2013] [Accepted: 02/15/2013] [Indexed: 02/08/2023]
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16
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The challenge of merging food safety diagnostic needs with quantitative PCR platforms. Trends Food Sci Technol 2011. [DOI: 10.1016/j.tifs.2011.02.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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17
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Comparison of In-house and Commercial Real-time PCR Systems for the Detection of Enterobacteriaceae and their Evaluation Within an Interlaboratory Study Using Infant Formula Samples. FOOD ANAL METHOD 2011. [DOI: 10.1007/s12161-010-9188-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Saha R, Bechanko R, Bestervelt LL, Donofrio RS. Evaluation of molecular techniques for identification and enumeration of Raoultella terrigena ATCC 33257 in water purifier efficacy testing. J Ind Microbiol Biotechnol 2010; 38:1337-44. [PMID: 21132347 DOI: 10.1007/s10295-010-0917-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Accepted: 11/18/2010] [Indexed: 10/18/2022]
Abstract
Raoultella terrigena ATCC 33257, a representative of the coliform group, is commonly used as a challenge organism in water purifier efficacy testing. In addition to being time consuming, traditional culturing techniques and metabolic identification systems (including automated systems) also fail to accurately differentiate this organism from its closely related neighbors belonging to the Enterobacteriaceae group. Molecular-based techniques, such as real-time quantitative polymerase chain reaction (qPCR) and enterobacterial repetitive intergenic consensus (ERIC)-PCR fingerprinting, are preferred methods of detection because of their accuracy, reproducibility, specificity, and sensitivity, along with shorter turnaround time. ERIC-PCR performed with the 1R primer set demonstrated stable unique banding patterns (~800, ~300 bp) for R. terrigena ATCC 33257 different from patterns observed for R. planticola and R. ornithinolytica. The primer pair developed from gyraseA (gyrA) sequence of R. terrigena for the SYBR Green qPCR assay using the AlleleID(®) 7.0 primer probe design software was highly specific and sensitive for the target organism. The sensitivity of the assay was 10(1) colony forming units (CFU)/ml for whole cells and 4.7 fg with genomic DNA. The primer pair was successful in determining the concentration (5.5 ± 0.3 × 10(6) CFU/ml) of R. terrigena from water samples spiked with equal concentration of Escherichia coli and R. terrigena. Based on these results from the ERIC-PCR and the SYBR Green qPCR assay, these molecular techniques can be efficiently used for rapid identification and quantification of R. terrigena during water purifier testing.
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Affiliation(s)
- Ratul Saha
- NSF International, Microbiology Division, 789 Dixboro Road, Ann Arbor, MI 48105, USA.
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