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Wu Q, Liu X, Wang J, Xu S, Zeng F, Chen L, Zhang G, Wang H. An isothermal nucleic acid amplification-based enzymatic recombinase amplification method for dual detection of porcine epidemic diarrhea virus and porcine rotavirus A. Virology 2024; 594:110062. [PMID: 38522136 DOI: 10.1016/j.virol.2024.110062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 03/06/2024] [Accepted: 03/14/2024] [Indexed: 03/26/2024]
Abstract
Viral diarrhea is the predominant digestive tract sickness in piglings, resulting in substantial profit losses in the porcine industry. Porcine rotavirus A (PoRVA) and porcine epidemic diarrhea virus (PEDV) are the main causes of grave gastroenteritis and massive dysentery, especially in piglets. PoRVA and PEDV have high transmissibility, exhibit similar clinical symptoms, and frequently co-occur. Therefore, to avoid financial losses, a quick, highly efficient, objective diagnostic test for the prevention and detection of these diseases is required. Enzymatic recombinase amplification (ERA) is a novel technology based on isothermal nucleic acid amplification. It demonstrates high sensitivity and excellent specificity, with a short processing time and easy operability, compared with other in vitro nucleic acid amplification technologies. In this study, a dual ERA method to detect and distinguish between PEDV and PoRVA nucleic acids was established. The method shows high sensitivity, as the detection limits were 101 copies/μL for both viruses. To test the usefulness of this method in clinical settings, we tested 64 swine clinical samples. Our results were 100% matched with those acquired using a commercially available kit. Therefore, we have successfully developed a dual diagnostic ERA nucleic acids method for detecting and distinguishing between PEDV and PoRVA.
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Affiliation(s)
- Qianwen Wu
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510462, China
| | - Xing Liu
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510462, China
| | - Jingyu Wang
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510462, China
| | - Sijia Xu
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510462, China
| | - Fanliang Zeng
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510462, China
| | - Ling Chen
- Ganzhou Quannan County Agriculture and Rural Bureau, Ganzhou, 341800, China
| | - Guihong Zhang
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510462, China; Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Maoming, 525000, China; National Engineering Research Center for Breeding Swine Industry, South China Agricultural University, Guangzhou, 510642, China.
| | - Heng Wang
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510462, China; Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Maoming, 525000, China; National Engineering Research Center for Breeding Swine Industry, South China Agricultural University, Guangzhou, 510642, China.
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Abu N, Mohd Bakhori N, Shueb RH. Lateral Flow Assay for Hepatitis B Detection: A Review of Current and New Assays. MICROMACHINES 2023; 14:1239. [PMID: 37374824 DOI: 10.3390/mi14061239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 06/03/2023] [Accepted: 06/06/2023] [Indexed: 06/29/2023]
Abstract
From acute to chronic hepatitis, cirrhosis, and hepatocellular cancer, hepatitis B infection causes a broad spectrum of liver diseases. Molecular and serological tests have been used to diagnose hepatitis B-related illnesses. Due to technology limitations, it is challenging to identify hepatitis B infection cases at an early stage, particularly in a low- and middle-income country with constrained resources. Generally, the gold-standard methods to detect hepatitis B virus (HBV) infection requires dedicated personnel, bulky, expensive equipment and reagents, and long processing times which delay the diagnosis of HBV. Thus, lateral flow assay (LFA), which is inexpensive, straightforward, portable, and operates reliably, has dominated point-of-care diagnostics. LFA consists of four parts: a sample pad where samples are dropped; a conjugate pad where labeled tags and biomarker components are combined; a nitrocellulose membrane with test and control lines for target DNA-probe DNA hybridization or antigen-antibody interaction; and a wicking pad where waste is stored. By modifying the pre-treatment during the sample preparation process or enhancing the signal of the biomarker probes on the membrane pad, the accuracy of the LFA for qualitative and quantitative analysis can be improved. In this review, we assembled the most recent developments in LFA technologies for the progress of hepatitis B infection detection. Prospects for ongoing development in this area are also covered.
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Affiliation(s)
- Norhidayah Abu
- Department of Medical Microbiology and Parasitology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian 16150, Kelantan, Malaysia
- Advanced Materials Research Centre (AMREC), SIRIM Berhad, Lot 34, Jalan Hi-Tech 2/3, Kulim Hi-Tech Park, Kulim 09000, Kedah, Malaysia
| | - Noremylia Mohd Bakhori
- Advanced Materials Research Centre (AMREC), SIRIM Berhad, Lot 34, Jalan Hi-Tech 2/3, Kulim Hi-Tech Park, Kulim 09000, Kedah, Malaysia
| | - Rafidah Hanim Shueb
- Department of Medical Microbiology and Parasitology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian 16150, Kelantan, Malaysia
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3
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Wang Y, He Z, Ablimit P, Ji S, Jin D. Development of multiplex cross displacement amplification combined with lateral flow biosensor assay for detection of virulent shigella sonnei. Front Cell Infect Microbiol 2022; 12:1012105. [PMID: 36339345 PMCID: PMC9627043 DOI: 10.3389/fcimb.2022.1012105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 10/04/2022] [Indexed: 11/13/2022] Open
Abstract
Shigella sonnei is the most common Shigella spp. in developed areas and the second most common in undeveloped regions. In this study, a multiple cross displacement amplification (MCDA) assay was used in combination with a lateral flow biosensor (LFB) assay to detect virulent S. sonnei strains containing the ipaH and wbgX genes. The multiplex MCDA-LFB assay detected wbgX at ≥1 pg/μL and ipaH at ≥10 fg/μL within 30 min in pure cultures maintained at 63°C. This assay was sensitive for ~37 CFU of virulent S. sonnei and ~3.7 CFU of Shigella spp. and enteroinvasive E. coli in stimulated fecal samples and had 100% specificity among 59 reference strains. The MCDA-LFB assay was also able to differentiate between virulent S. sonnei and other Shigella spp. and enteroinvasive E. coli among 99 clinical isolates. In summary, a multiplex MCDA-LFB assay was developed for rapid, convenient, point-of-care, and accurate identification of virulent S. sonnei within 30 min and at a constant temperature without the need for expensive lab equipment.
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Affiliation(s)
- Yonglu Wang
- Ma’anshan Center for Disease Control and Prevention, Ma’anshan, China
- Pishan County Center for Disease Control and Prevention, Hotan Prefecture, China
| | - Ziqiang He
- State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Patigul Ablimit
- Pishan County Center for Disease Control and Prevention, Hotan Prefecture, China
| | - Shunshi Ji
- State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Dong Jin
- State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
- *Correspondence: Dong Jin,
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4
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Chen X, Yuan W, Zhou Q, Tan Y, Wang R, Dong S. Sensitive and visual identification of Chlamydia trachomatis using multiple cross displacement amplification integrated with a gold nanoparticle-based lateral flow biosensor for point-of-care use. Front Cell Infect Microbiol 2022; 12:949514. [PMID: 35937700 PMCID: PMC9355032 DOI: 10.3389/fcimb.2022.949514] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Accepted: 06/28/2022] [Indexed: 11/13/2022] Open
Abstract
Chlamydia trachomatis is the leading cause of bacterial sexually transmitted infection (STI) and remains a major public health challenge, especially in less-developed regions. Establishing a rapid, inexpensive, and easy-to-interpret point-of-care (POC) testing system for C. trachomatis could be critical for its treatment and limiting further transmission. Here, we devised a novel approach termed a multiple cross displacement amplification integrated with gold nanoparticle-based lateral flow biosensor (MCDA-AuNPs-LFB) for the highly specific, sensitive, user-friendly, and rapid identification of C. trachomatis in clinical samples. A suite of MCDA primers based on the C. trachomatis ompA gene from 14 serological variants (serovar A-K, L1, L2, and L3) were successfully designed and used to establish the assay. Optimal assay conditions were identified at 67°C, and the detection procedure, including nucleic acid preparation (approximately 5 min), MCDA amplification (30 min), and AuNPs-LFB visual readout (within 2 min), was completed within 40 min. The all-in cost for each test was approximately $5.5 USD. The limit of detection (LoD) was 10 copies/reaction, and no cross-reaction was observed with non-C. trachomatis microbes. A total of 135 suspected C. trachomatis-infection genital secretion samples were collected and simultaneously detected using real-time quantitative PCR (qPCR) in our assay. Compared with the qPCR technology, the MCDA-AuNPs-LFB sensitivity, specificity, positive predictive value, and negative predictive value were 100%, 96.20%, 94.92%, and 100%, respectively. Hence, our MCDA-AuNP-LFB assay exhibited considerable potential for POC testing and could be used to identify C. trachomatis in clinical settings, particularly in low-income regions.
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Affiliation(s)
- Xu Chen
- The Second Clinical College, Guizhou University of Traditional Chinese Medicine, Guiyang, China
- Clinical Medical Laboratory of the Second Affiliated Hospital, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Wei Yuan
- Quality Control Department, Guizhou Provincial Center for Clinical Laboratory, Guiyang, China
| | - Qingxue Zhou
- Clinical Laboratory, Hangzhou Women’s Hospital, Hangzhou, China
| | - Yan Tan
- Quality Control Department, Guizhou Provincial Center for Clinical Laboratory, Guiyang, China
| | - Ronghua Wang
- Department of Clinical Laboratory, Longli people’s Hospital, Qianlan, China
| | - Shilei Dong
- Department of Clinical Laboratory, Zhejiang Hospital, Hangzhou, China
- *Correspondence: Shilei Dong,
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Lin S, Song X, Zhu K, Shao Q, Chen Y, Cheng W, Lei Z, Chen Y, Luo Y, Jin D. Performance Evaluation of a Novel Ultrafast Molecular Diagnostic Device Integrated With Microfluidic Chips and Dual Temperature Modules. Front Bioeng Biotechnol 2022; 10:895236. [PMID: 35662850 PMCID: PMC9162139 DOI: 10.3389/fbioe.2022.895236] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 04/29/2022] [Indexed: 11/13/2022] Open
Abstract
Ultrafast, portable, and inexpensive molecular diagnostic platforms are critical for clinical diagnosis and on-site detection. There are currently no available real-time polymerase chain reaction (PCR) devices able to meet the demands of point-of-care testing, as the heating and cooling processes cannot be avoided. In this study, the dual temperature modules were first designed to process microfluidic chips automatically circulating between them. Thus, a novel ultrafast molecular diagnostic real-time PCR device (approximately 18 and 23 min for DNA and RNA detection, respectively) with two channels (FAM and Cy5) for the detection of 12 targets was developed. The device contained three core functional components, including temperature control, optics, and motion, which were integrated into a portable compact box. The temperature modules accurately control temperature in rapid thermal cycles with less than ±0.1 °C, ±1 °C and ±0.5 °C for the temperature fluctuation, uniformity, and error of indication, respectively. The average coefficient of variation (CV) of the fluorescence intensity (FI) for all 12 wells was 2.3% for FAM and 2.7% for Cy5. There was a good linear relationship between the concentrations of fluorescent dye and the FIs of FAM and Cy5(R2 = 0.9990 and 0.9937), and the average CVs of the Ct values calculated by the embedded software were 1.4% for FAM and Cy5, respectively. The 100 double-blind mocked sputum and 249 clinical stool samples were analyzed by the ultrafast real-time PCR device in comparison with the DAAN Gene SARS-CoV-2 kit run on the ABI 7500 instrument and Xpert C. difficile/Epi, respectively. Among the 249 stool samples, the ultrafast real-time PCR device detected toxigenic C. difficile in 54 samples (54/249, 21.7%) with a specificity and positive predictive values of 99.0 and 96.3%, which were higher than the Xpert C. difficile/Epi values of 94.4 and 88.1% (p > 0.05). The ultrafast real-time PCR device detected 15 SARS-CoV-2 positive samples, which has a 100% concordance with that obtained by the DAAN Gene SARS-CoV-2 kit. This study demonstrated that the ultrafast real-time PCR device integrated with microfluidic chips and dual temperature modules is an ultrafast, reliable, easy-to-use, and cost-effective molecular diagnostic platform for clinical diagnosis and on-site testing, especially in resource-limited settings.
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Affiliation(s)
- Shan Lin
- School of Laboratory Medicine, Hangzhou Medical College, Hangzhou, China
- Key Laboratory of Biomarkers and In Vitro Diagnosis Translation of Zhejiang Province, Hangzhou, China
| | - Xiaojun Song
- Department of Clinical Laboratory, Laboratory Medicine Center, Zhejiang Provincial People’s Hospital, Hangzhou Medical College, Hangzhou, China
| | - Kun Zhu
- Hangzhou Biochip for Diagnosis Technology Co., Ltd., Hangzhou, China
| | - Quanyu Shao
- Hangzhou Biochip for Diagnosis Technology Co., Ltd., Hangzhou, China
| | - Yinhang Chen
- Hangzhou Biochip for Diagnosis Technology Co., Ltd., Hangzhou, China
| | - Wei Cheng
- Hangzhou Biochip for Diagnosis Technology Co., Ltd., Hangzhou, China
| | - Zhijing Lei
- Hangzhou Biochip for Diagnosis Technology Co., Ltd., Hangzhou, China
| | - Yu Chen
- School of Laboratory Medicine, Hangzhou Medical College, Hangzhou, China
- Key Laboratory of Biomarkers and In Vitro Diagnosis Translation of Zhejiang Province, Hangzhou, China
| | - Yun Luo
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW, Australia
- *Correspondence: Yun Luo, ; Dazhi Jin,
| | - Dazhi Jin
- School of Laboratory Medicine, Hangzhou Medical College, Hangzhou, China
- Key Laboratory of Biomarkers and In Vitro Diagnosis Translation of Zhejiang Province, Hangzhou, China
- Department of Clinical Laboratory, Laboratory Medicine Center, Zhejiang Provincial People’s Hospital, Hangzhou Medical College, Hangzhou, China
- *Correspondence: Yun Luo, ; Dazhi Jin,
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6
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Vindeirinho JM, Pinho E, Azevedo NF, Almeida C. SARS-CoV-2 Diagnostics Based on Nucleic Acids Amplification: From Fundamental Concepts to Applications and Beyond. Front Cell Infect Microbiol 2022; 12:799678. [PMID: 35402302 PMCID: PMC8984495 DOI: 10.3389/fcimb.2022.799678] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 02/18/2022] [Indexed: 02/06/2023] Open
Abstract
COVID-19 pandemic ignited the development of countless molecular methods for the diagnosis of SARS-CoV-2 based either on nucleic acid, or protein analysis, with the first establishing as the most used for routine diagnosis. The methods trusted for day to day analysis of nucleic acids rely on amplification, in order to enable specific SARS-CoV-2 RNA detection. This review aims to compile the state-of-the-art in the field of nucleic acid amplification tests (NAATs) used for SARS-CoV-2 detection, either at the clinic level, or at the Point-Of-Care (POC), thus focusing on isothermal and non-isothermal amplification-based diagnostics, while looking carefully at the concerning virology aspects, steps and instruments a test can involve. Following a theme contextualization in introduction, topics about fundamental knowledge on underlying virology aspects, collection and processing of clinical samples pave the way for a detailed assessment of the amplification and detection technologies. In order to address such themes, nucleic acid amplification methods, the different types of molecular reactions used for DNA detection, as well as the instruments requested for executing such routes of analysis are discussed in the subsequent sections. The benchmark of paradigmatic commercial tests further contributes toward discussion, building on technical aspects addressed in the previous sections and other additional information supplied in that part. The last lines are reserved for looking ahead to the future of NAATs and its importance in tackling this pandemic and other identical upcoming challenges.
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Affiliation(s)
- João M. Vindeirinho
- National Institute for Agrarian and Veterinarian Research (INIAV, I.P), Vairão, Portugal
- Laboratory for Process Engineering, Environment, Biotechnology and Energy (LEPABE), Faculty of Engineering, University of Porto, Porto, Portugal
- Associate Laboratory in Chemical Engineering (ALiCE), Faculty of Engineering, University of Porto, Porto, Portugal
| | - Eva Pinho
- National Institute for Agrarian and Veterinarian Research (INIAV, I.P), Vairão, Portugal
- Laboratory for Process Engineering, Environment, Biotechnology and Energy (LEPABE), Faculty of Engineering, University of Porto, Porto, Portugal
- Associate Laboratory in Chemical Engineering (ALiCE), Faculty of Engineering, University of Porto, Porto, Portugal
| | - Nuno F. Azevedo
- Laboratory for Process Engineering, Environment, Biotechnology and Energy (LEPABE), Faculty of Engineering, University of Porto, Porto, Portugal
- Associate Laboratory in Chemical Engineering (ALiCE), Faculty of Engineering, University of Porto, Porto, Portugal
| | - Carina Almeida
- National Institute for Agrarian and Veterinarian Research (INIAV, I.P), Vairão, Portugal
- Laboratory for Process Engineering, Environment, Biotechnology and Energy (LEPABE), Faculty of Engineering, University of Porto, Porto, Portugal
- Associate Laboratory in Chemical Engineering (ALiCE), Faculty of Engineering, University of Porto, Porto, Portugal
- Centre of Biological Engineering (CEB), University of Minho, Braga, Portugal
- *Correspondence: Carina Almeida,
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Wu X, Chen Q, Li J, Liu Z. Diagnostic techniques for COVID-19: A mini-review. J Virol Methods 2022; 301:114437. [PMID: 34933045 PMCID: PMC8684097 DOI: 10.1016/j.jviromet.2021.114437] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 12/14/2021] [Accepted: 12/17/2021] [Indexed: 02/07/2023]
Abstract
COVID-19, a new respiratory infectious disease, was first reported at the end of 2019, in Wuhan, China. Now, COVID-19 is still causing major loss of human life and economic productivity in almost all countries around the world. Early detection, early isolation, and early diagnosis of COVID-19 patients and asymptomatic carriers are essential to blocking the spread of the pandemic. This paper briefly reviewed COVID-19 diagnostic assays for clinical application, including nucleic acid tests, immunological methods, and Computed Tomography (CT) imaging. Nucleic acid tests (NAT) target the virus genome and indicates the existence of the SARS-CoV-2 virus. Currently, real-time quantitative PCR (qPCR) is the most widely used NAT and, basically, is the most used diagnostic assay for COVID-19. Besides qPCR, many novel rapid and sensitive NAT assays were also developed. Serological testing (detection of serum antibodies specific to SARS-CoV-2), which belongs to the immunological methods, is also used in the diagnosis of COVID-19. The positive results of serological testing indicate the presence of antibodies specific to SARS-CoV-2 resulting from being infected with the virus. Viral antigen detection assays are also important immunological methods used mainly for rapid virus detection. However, only a few of these assays had been reported. CT imaging is still an important auxiliary diagnosis tool for COVID-19 patients, especially for symptomatic patients in the early stage, whose viral load is low and different to be identified by NAT. These diagnostic techniques are all good in some way and applying a combination of them will greatly improve the accuracy of COVID-19 diagnostics.
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Affiliation(s)
- Xianyong Wu
- School of Life Sciences, Shanghai University, Shanghai, 200444, China
| | - Qiming Chen
- School of Life Sciences, Shanghai University, Shanghai, 200444, China
| | - Junhai Li
- Department of Oncology, No. 215 Hospital of Shaanxi Nuclear Industry, Xianyang City, Shaanxi Province, 712000, China.
| | - Zhanmin Liu
- School of Life Sciences, Shanghai University, Shanghai, 200444, China.
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De Felice M, De Falco M, Zappi D, Antonacci A, Scognamiglio V. Isothermal amplification-assisted diagnostics for COVID-19. Biosens Bioelectron 2022; 205:114101. [PMID: 35202984 PMCID: PMC8849862 DOI: 10.1016/j.bios.2022.114101] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 02/02/2022] [Accepted: 02/14/2022] [Indexed: 12/12/2022]
Abstract
The scenery of molecular diagnostics for infectious diseases is rapidly evolving to respond to the COVID-19 epidemic. The sensitivity and specificity of diagnostics, along with speed and accuracy, are crucial requirements for effective analytical tools to address the disease spreading around the world. Emerging diagnostic devices combine the latest trends in isothermal amplification methods for nucleic acids with state-of-the-art biosensing systems, intending to bypass roadblocks encountered in the last 2 years of the pandemic. Isothermal nucleic acid amplification is a simple procedure that quickly and efficiently accumulates nucleic acid sequences at a constant temperature, without the need for sophisticated equipment. The integration of isothermal amplification into portable biosensing devices confers high sensitivity and improves screening at the point of need in low-resource settings. This review reports the latest trends reached in this field with the latest examples of isothermal amplification-powered biosensors for detecting SARS-CoV-2, with different configurations, as well as their intrinsic advantages and disadvantages.
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Affiliation(s)
- Mariarita De Felice
- Institute of Bioscience and BioResources, National Research Council, Department of Biology, Agriculture and Food Science, Via P. Castellino 111, 80100, Naples, Italy
| | - Mariarosaria De Falco
- Institute of Bioscience and BioResources, National Research Council, Department of Biology, Agriculture and Food Science, Via P. Castellino 111, 80100, Naples, Italy
| | - Daniele Zappi
- Institute of Crystallography, National Research Council, Department of Chemical Sciences and Materials Technologies, Via Salaria km 29.300, 00015, Monterotondo, Rome, Italy
| | - Amina Antonacci
- Institute of Crystallography, National Research Council, Department of Chemical Sciences and Materials Technologies, Via Salaria km 29.300, 00015, Monterotondo, Rome, Italy
| | - Viviana Scognamiglio
- Institute of Crystallography, National Research Council, Department of Chemical Sciences and Materials Technologies, Via Salaria km 29.300, 00015, Monterotondo, Rome, Italy.
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De Falco M, De Felice M, Rota F, Zappi D, Antonacci A, Scognamiglio V. Next-generation diagnostics: augmented sensitivity in amplification-powered biosensing. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Li P, Shen G, Zhu Z, Shi S, Hu Y, Zeng Z, Zhou H, Li Q, Zhu P, Yang G, Liu Z, Fu H, Hu J, He Y, Yang Q, Dai M, Zhou D, Lu Q, Xie X. Dynamic changes of IgM and IgG antibodies in asymptomatic patients as an effective way to detect SARS-CoV-2 infection. J Clin Lab Anal 2021; 36:e24080. [PMID: 34914135 PMCID: PMC8761420 DOI: 10.1002/jcla.24080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 10/17/2021] [Accepted: 10/18/2021] [Indexed: 12/15/2022] Open
Abstract
Background COVID‐19 has become a global pandemic, and close contacts and asymptomatic patients are worthy of attention. Methods A total of 1844 people in close contacts with 76 COVID‐19 patients were investigated, and nasopharyngeal swabs and venous blood were collected for centralized medical quarantine observation. Real‐time fluorescence was used to detect SARS‐CoV‐2 nucleic acid in nasopharyngeal swabs of all close contacts, and the colloidal gold method was used to detect serum‐specific antibodies. Levels of IgM‐ and IgG‐specific antibodies were detected quantitatively through chemiluminescence from the first nucleic acid turned negative date (0 week) and on weekly intervals of ≤1 week, 1–2 weeks, 2–3 weeks, 3–4 weeks, 4–5 weeks, 5–6 weeks, and 6–7 weeks. Results The total positive rate of the colloidal gold method (88.5%, 23/26) was significantly higher (χ2 = 59.182, p < 0.001) than that of the healthy control group (2.0%, 1/50). There was significant difference in IgG concentration at different time points (0–7 weeks) after negative nucleic acid conversion (χ2 = 14.034, p = 0.029). Serum IgG levels were significantly higher at weekly time points of 4–5 weeks (Z = −2.399, p = 0.016), 5–6 weeks (Z = −2.049, p = 0.040), and 6–7 weeks (Z = −2.197, p = 0.028) compared with 1–2 weeks after negative nucleic acid conversion. However, there was no significant difference (χ2 = 4.936, p = 0.552) in IgM concentration between time points tested (0–7 weeks) after negative nucleic acid conversion. The positive rates of IgM and IgG in asymptomatic patients (χ2 = 84.660, p < 0.001) were significantly higher than those in the healthy control group (χ2 = 9.201, p = 0.002) within 7 weeks of negative nucleic acid conversion. Conclusions The IgG concentration in asymptomatic cases remained at a high level after nucleic acid turned negative. Nucleic acid detection combined with IgM and IgG antibody detection is an effective way to screen asymptomatic infections.
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Affiliation(s)
- Ping Li
- Medical Laboratory Center, First Hospital of Hunan University of Chinese Medicine, Changsha, China
| | - Ge Shen
- Loudi Center for Diseases Control and Prevention, Loudi, China
| | - Zhenhua Zhu
- Department of Otorhinolaryngology, First Hospital of Hunan University of Chinese Medicine, Changsha, China
| | - Shengjie Shi
- Medical Laboratory Center, First Hospital of Hunan University of Chinese Medicine, Changsha, China
| | - Yan Hu
- Medical Laboratory Center, First Hospital of Hunan University of Chinese Medicine, Changsha, China
| | - Ziyan Zeng
- Loudi Center for Diseases Control and Prevention, Loudi, China
| | - Hui Zhou
- Medical Laboratory Center, First Hospital of Hunan University of Chinese Medicine, Changsha, China
| | - Qiong Li
- Medical Laboratory Center, First Hospital of Hunan University of Chinese Medicine, Changsha, China
| | - Pan Zhu
- Loudi Center for Diseases Control and Prevention, Loudi, China
| | - Gang Yang
- Loudi Center for Diseases Control and Prevention, Loudi, China
| | - Zugui Liu
- Loudi Center for Diseases Control and Prevention, Loudi, China
| | - Huiyuan Fu
- Loudi Center for Diseases Control and Prevention, Loudi, China
| | - Junyu Hu
- Loudi Center for Diseases Control and Prevention, Loudi, China
| | - Ying He
- Loudi Center for Diseases Control and Prevention, Loudi, China
| | - Qingting Yang
- Loudi Center for Diseases Control and Prevention, Loudi, China
| | - Miao Dai
- Loudi Center for Diseases Control and Prevention, Loudi, China
| | - Dan Zhou
- Loudi Center for Diseases Control and Prevention, Loudi, China
| | - Qingqing Lu
- Medical Laboratory Center, First Hospital of Hunan University of Chinese Medicine, Changsha, China
| | - Xiaobing Xie
- Medical Laboratory Center, First Hospital of Hunan University of Chinese Medicine, Changsha, China
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11
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A semi-automated, isolation-free, high-throughput SARS-CoV-2 reverse transcriptase (RT) loop-mediated isothermal amplification (LAMP) test. Sci Rep 2021; 11:21385. [PMID: 34725400 PMCID: PMC8560768 DOI: 10.1038/s41598-021-00827-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 10/12/2021] [Indexed: 12/15/2022] Open
Abstract
Shortages of reverse transcriptase (RT)-polymerase chain reaction (PCR) reagents and related equipment during the COVID-19 pandemic have demonstrated the need for alternative, high-throughput methods for severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2)-mass screening in clinical diagnostic laboratories. A robust, SARS-CoV-2 RT-loop-mediated isothermal amplification (RT-LAMP) assay with high-throughput and short turnaround times in a clinical laboratory setting was established and compared to two conventional RT-PCR protocols using 323 samples of individuals with suspected SARS-CoV-2 infection. Limit of detection (LoD) and reproducibility of the isolation-free SARS-CoV-2 RT-LAMP test were determined. An almost perfect agreement (Cohen's kappa > 0.8) between the novel test and two classical RT-PCR protocols with no systematic difference (McNemar's test, P > 0.05) was observed. Sensitivity and specificity were in the range of 89.5 to 100% and 96.2 to 100% dependent on the reaction condition and the RT-PCR method used as reference. The isolation-free RT-LAMP assay showed high reproducibility (Tt intra-run coefficient of variation [CV] = 0.4%, Tt inter-run CV = 2.1%) with a LoD of 95 SARS-CoV-2 genome copies per reaction. The established SARS-CoV-2 RT-LAMP assay is a flexible and efficient alternative to conventional RT-PCR protocols, suitable for SARS-CoV-2 mass screening using existing laboratory infrastructure in clinical diagnostic laboratories.
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