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Maillard O, Belot J, Adenis T, Rollot O, Adenis A, Guihard B, Gérardin P, Bertolotti A. Early diagnosis of dengue: Diagnostic utility of the SD BIOLINE Dengue Duo rapid test in Reunion Island. PLoS Negl Trop Dis 2023; 17:e0011253. [PMID: 36996260 PMCID: PMC10089357 DOI: 10.1371/journal.pntd.0011253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 04/11/2023] [Accepted: 03/20/2023] [Indexed: 04/01/2023] Open
Abstract
BACKGROUND In Reunion Island, dengue outbreaks have been occurring since 2018. The healthcare facilities are facing the problem of managing a massive influx of patients and a growing care burden. The aim of this study was to evaluate the performance of the SD Bioline Dengue Duo rapid diagnostic test in adults consulting at an emergency department during the 2019 epidemic. METHODOLOGY/PRINCIPAL FINDINGS This retrospective study of diagnostic accuracy included patients over 18 years old, suspected of dengue, who were admitted to emergency units of the University Hospital of Reunion between the 1st of January and 30th of June, 2019, and were tested for dengue fever with the SD Bioline Dengue Duo rapid diagnostic test and reverse transcriptase polymerase chain reaction. Over the study period, 2099 patients were screened retrospectively. Of them, 671 patients matched the inclusion criteria. The overall rapid diagnostic test performance was 42% for sensitivity and 15% for specificity. The non-structural 1 antigen component had a good specificity of 82% but a low sensitivity of 12%. The immunoglobulin M component had a sensitivity of 28% and a specificity of 33%. Sensitivities were slightly improved beyond the 5th day of illness compared to the early stage for all components, but only the non-structural 1 antigen component had a better specificity of 91%. Furthermore, predictive values were low and post-test probabilities never improved pre-test probabilities in our setting. CONCLUSIONS/SIGNIFICANCE These results suggest that the SD Bioline Dengue Duo RDT did not achieve sufficient performance levels to rule in, or discard, an early point of care dengue diagnosis in the emergency department during the 2019 epidemic in Reunion.
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Affiliation(s)
- Olivier Maillard
- Department of Public Health and Research, CHU Réunion, Saint-Pierre, Reunion, France
- Clinical Investigation Center, INSERM CIC1410, CHU Réunion, Saint Pierre, Reunion, France
| | - Jeanne Belot
- Department of Emergency Medicine, CHU Réunion, Saint-Pierre, Reunion, France
| | - Thibault Adenis
- Department of Emergency Medicine, CHU Réunion, Saint-Pierre, Reunion, France
| | - Olivier Rollot
- Department of Public Health and Research, CHU Réunion, Saint-Pierre, Reunion, France
- Clinical Investigation Center, INSERM CIC1410, CHU Réunion, Saint Pierre, Reunion, France
| | - Antoine Adenis
- Department of Public Health and Research, CH Andrée Rosemon, Cayenne, French Guiana, France
- Clinical Investigation Center, INSERM CIC1424, CH Andrée Rosemon, Cayenne, French Guiana, France
| | - Bertrand Guihard
- Department of Emergency Medicine, CHU Réunion, Saint Denis, Reunion, France
| | - Patrick Gérardin
- Department of Public Health and Research, CHU Réunion, Saint-Pierre, Reunion, France
- Clinical Investigation Center, INSERM CIC1410, CHU Réunion, Saint Pierre, Reunion, France
| | - Antoine Bertolotti
- Clinical Investigation Center, INSERM CIC1410, CHU Réunion, Saint Pierre, Reunion, France
- Department of Infectious Diseases and Dermatology, CHU Réunion, Saint-Pierre, Reunion, France
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Machain-Williams C, Reyes-Solis GC, Blitvich BJ, Laredo-Tiscareño V, Dzul-Rosado AR, Kim S, AbuBakar S. Evaluation of an Immunoglobulin E Capture Enzyme-Linked Immunosorbent Assay for the Early Diagnosis of Dengue. Viral Immunol 2023; 36:101-109. [PMID: 36862827 DOI: 10.1089/vim.2022.0110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023] Open
Abstract
Dengue virus (DENV) is the etiological agent of dengue, the most important mosquito-transmitted viral disease of humans worldwide. Enzyme-linked immunosorbent assays (ELISAs) designed to detect DENV IgM are commonly used for dengue diagnosis. However, DENV IgM is not reliably detected until ≥4 days after illness onset. Reverse transcription-polymerase chain reaction (RT-PCR) can diagnose early dengue but requires specialized equipment, reagents, and trained personnel. Additional diagnostic tools are needed. Limited work has been performed to determine whether IgE-based assays can be used for the early detection of vector-borne viral diseases, including dengue. In this study, we determined the efficacy of a DENV IgE capture ELISA for the detection of early dengue. Sera were collected within the first 4 days of illness onset from 117 patients with laboratory-confirmed dengue, as determined by DENV-specific RT-PCR. The serotypes responsible for the infections were DENV-1 and DENV-2 (57 and 60 patients, respectively). Sera were also collected from 113 dengue-negative individuals with febrile illness of undetermined etiology and 30 healthy controls. The capture ELISA detected DENV IgE in 97 (82.9%) confirmed dengue patients and none of the healthy controls. There was a high false positivity rate (22.1%) among the febrile non-dengue patients. In conclusion, we provide evidence that IgE capture assays have the potential to be explored for early diagnosis of dengue, but further research is necessary to address the possible false positivity rate among patients with other febrile illnesses.
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Affiliation(s)
- Carlos Machain-Williams
- Laboratorio de Arbovirologia, Centro de Investigaciones Regionales "Dr. Hideyo Noguchi," Universidad Autónoma de Yucatan, Merida, Yucatan, Mexico
| | - Guadalupe C Reyes-Solis
- Laboratorio de Arbovirologia, Centro de Investigaciones Regionales "Dr. Hideyo Noguchi," Universidad Autónoma de Yucatan, Merida, Yucatan, Mexico
| | - Bradley J Blitvich
- Department of Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa, USA
| | - Viridiana Laredo-Tiscareño
- Laboratorio de Arbovirologia, Centro de Investigaciones Regionales "Dr. Hideyo Noguchi," Universidad Autónoma de Yucatan, Merida, Yucatan, Mexico.,Department of Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa, USA
| | | | - Sungmin Kim
- Department of Infectious Diseases in Internal Medicine, Sejong Chungnam National University Hospital, School of Medicine, Chungnam National University, Sejong, Korea
| | - Sazaly AbuBakar
- Tropical Infectious Diseases Research and Education Centre (TIDREC), Higher Institution Center of Excellence (HICOE), Universiti Malaya, Kuala Lumpur, Malaysia
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3
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Fisher R, Lustig Y, Sklan EH, Schwartz E. The Role of NS1 Protein in the Diagnosis of Flavivirus Infections. Viruses 2023; 15:v15020572. [PMID: 36851784 PMCID: PMC9963814 DOI: 10.3390/v15020572] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 02/12/2023] [Accepted: 02/17/2023] [Indexed: 02/22/2023] Open
Abstract
Nonstructural protein 1 (NS1) is a glycoprotein among the flavivirus genus. It is found in both membrane-associated and soluble secreted forms, has an essential role in viral replication, and modulates the host immune response. NS1 is secreted from infected cells within hours after viral infection, and thus immunodetection of NS1 can be used for early serum diagnosis of dengue fever infections instead of real-time (RT)-PCR. This method is fast, simple, and affordable, and its availability could provide an easy point-of-care testing solution for developing countries. Early studies show that detecting NS1 in cerebrospinal fluid (CSF) samples is possible and can improve the surveillance of patients with dengue-associated neurological diseases. NS1 can be detected postmortem in tissue specimens. It can also be identified using noninvasive methods in urine, saliva, and dried blood spots, extending the availability and effective detection period. Recently, an enzyme-linked immunosorbent assay (ELISA) assay for detecting antibodies directed against Zika virus NS1 has been developed and used for diagnosing Zika infection. This NS1-based assay was significantly more specific than envelope protein-based assays, suggesting that similar assays might be more specific for other flaviviruses as well. This review summarizes the knowledge on flaviviruses' NS1's potential role in antigen and antibody diagnosis.
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Affiliation(s)
- Ron Fisher
- Department of Otolaryngology/Head & Neck Surgery, Hadassah Hebrew; University Medical Center, Jerusalem 91120, Israel
| | - Yaniv Lustig
- Central Virology Laboratory, Ministry of Health, Sheba Medical Center, Ramat-Gan 52621, Israel
- Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv 69978, Israel
| | - Ella H. Sklan
- Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv 69978, Israel
| | - Eli Schwartz
- Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv 69978, Israel
- The Center of Geographic Medicine and Tropical Diseases, Sheba Medical Center, Ramat-Gan 52621, Israel
- Correspondence:
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Gaber M, Ahmad AA, El-Kady AM, Tolba M, Suzuki Y, Mohammed SM, Elossily NA. Dengue fever as a reemerging disease in upper Egypt: Diagnosis, vector surveillance and genetic diversity using RT-LAMP assay. PLoS One 2022; 17:e0265760. [PMID: 35499983 PMCID: PMC9060354 DOI: 10.1371/journal.pone.0265760] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Accepted: 03/07/2022] [Indexed: 11/18/2022] Open
Abstract
Background
The recent increase in dengue virus (DENV) outbreaks and the absence of an effective vaccine have highlighted the importance of developing rapid and effective diagnostic surveillance tests and mosquito-based screening programs. To establish effective control measures for preventing future DENV transmission, the present study was established to identify the main mosquito vector involved in the dengue fever (DF) outbreak in Upper Egypt in 2016 and detect the diversity of dengue virus serotypes circulating in both humans and vectors.
Methods
We investigated the prevalence of DENV infection and circulating serotypes in the sera of 51 humans clinically suspected of DF and 1800 field-collected Aedes aegypti adult female mosquitoes grouped into 36 pooled samples. Both DENV non-structural protein (NS1) immunochromatographic strip assay and loop-mediated isothermal amplification (LAMP) were used for screening.
Results
Overall, the rate of DENV infection in both human sera and pooled mosquito homogenate was 33.3%, as revealed by rapid dipstick immunochromatographic analysis. However, higher detection rates were observed with RT-LAMP assay of 60.8% and 44.4% for humans and vector mosquitoes, respectively. DENV-1 was the most prevalent serotype in both populations. A combination of two, three, or even four circulating serotypes was found in 87.5% of total positive pooled mosquito samples and 83.87% of DENV-positive human sera.
Conclusion
The study reinforces the evidence of the reemergence of Aedes aegypti in Upper Egypt, inducing an outbreak of DENV. Mosquito-based surveillance of DENV infection is important to elucidate the viral activity rate and define serotype diversity to understand the virus dynamics in the reinfested area. Up to our knowledge, this is the first report of serotyping of DENV infection in an outbreak in Egypt using RT-LAMP assay.
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Affiliation(s)
- Mona Gaber
- Department of Parasitology, Faculty of Medicine, Assiut University, Assiut, Egypt
| | | | - Asmaa M. El-Kady
- Department of Parasitology, Faculty of Medicine, South Valley University, Qena, Egypt
| | - Mohammed Tolba
- Department of Parasitology, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Yutaka Suzuki
- Department of Computational Biology and Medical Sciences, University of Tokyo, Kashiwanoha, Kashiwa, Chiba, Japan
| | - Shereen M. Mohammed
- Department of Microbiology and Immunology, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Nahed Ahmed Elossily
- Department of Parasitology, Faculty of Medicine, Assiut University, Assiut, Egypt
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Needs SH, Sirivisoot S, Jegouic S, Prommool T, Luangaram P, Srisawat C, Sriraksa K, Limpitikul W, Mairiang D, Malasit P, Avirutnan P, Puttikhunt C, Edwards AD. Smartphone multiplex microcapillary diagnostics using Cygnus: Development and evaluation of rapid serotype-specific NS1 detection with dengue patient samples. PLoS Negl Trop Dis 2022; 16:e0010266. [PMID: 35389998 PMCID: PMC8989202 DOI: 10.1371/journal.pntd.0010266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 02/18/2022] [Indexed: 11/18/2022] Open
Abstract
Laboratory diagnosis of dengue virus (DENV) infection including DENV serotyping requires skilled labor and well-equipped settings. DENV NS1 lateral flow rapid test (LFT) provides simplicity but lacks ability to identify serotype. A simple, economical, point-of-care device for serotyping is still needed. We present a gravity driven, smartphone compatible, microfluidic device using microcapillary film (MCF) to perform multiplex serotype-specific immunoassay detection of dengue virus NS1. A novel device–termed Cygnus–with a stackable design allows analysis of 1 to 12 samples in parallel in 40 minutes. A sandwich enzyme immunoassay was developed to specifically detect NS1 of all four DENV serotypes in one 60-μl plasma sample. This test aims to bridge the gap between rapid LFT and laboratory microplate ELISAs in terms of sensitivity, usability, accessibility and speed. The Cygnus NS1 assay was evaluated with retrospective undiluted plasma samples from 205 DENV infected patients alongside 50 febrile illness negative controls. Against the gold standard RT-PCR, clinical sensitivity for Cygnus was 82% in overall (with 78, 78, 80 and 76% for DENV1-4, respectively), comparable to an in-house serotyping NS1 microplate ELISA (82% vs 83%) but superior to commercial NS1-LFT (82% vs 74%). Specificity of the Cygnus device was 86%, lower than that of NS1-microplate ELISA and NS1-LFT (100% and 98%, respectively). For Cygnus positive samples, identification of DENV serotypes DENV2-4 matched those by RT-PCR by 100%, but for DENV1 capillaries false positives were seen, suggesting an improved DENV1 capture antibody is needed to increase specificity. Overall performance of Cygnus showed substantial agreement to NS1-microplate ELISA (κ = 0.68, 95%CI 0.58–0.77) and NS1-LFT (κ = 0.71, 95%CI 0.63–0.80). Although further refinement for DENV-1 NS1 detection is needed, the advantages of multiplexing and rapid processing time, this Cygnus device could deliver point-of-care NS1 antigen testing including serotyping for timely DENV diagnosis for epidemic surveillance and outbreak prediction. Diagnosis of the important mosquito-transmitted dengue virus (DENV) requires laboratory assays to detect viral genome (RT-PCR), viral NS1 protein (immunoassay) or DENV specific antibodies. Current point-of-care NS1 tests cannot distinguish serotype, so laboratory tests are still essential to determine which of 4 DENV serotypes is present. Here we present a rapid serotype-specific NS1 test in a portable microfluidic format. Ten parallel 0.2 mm tubes inside a flat plastic ribbon perform multiplex NS1 immunoassays. A simple cassette delivers sample and reagents sequentially through the microcapillaries by gravity. By stacking cassettes, 12 tests could be performed in under 40 minutes, with results recorded by smartphone. When evaluated with 205 patients plus 50 control samples, and results compared to conventional RT-PCR, the sensitivity for DENV1 to 4 was 78%, 78%, 80%, and 76%, respectively, with specificity of 100% for DENV2-4. DENV1 showed some false positives due to cross-reactivity of the capture antibody. Serotyping performance with MCF-Cygnus devices showed substantial agreement to the serotyping-NS1 microplate ELISA. Therefore, these simple and portable microcapillary immunoassay devices could support dengue NS1 serotyping with potential benefits for near-patient diagnosis, real-time epidemic surveillance and outbreak mapping.
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Affiliation(s)
- Sarah Helen Needs
- Reading School of Pharmacy, University of Reading, Whiteknights, Reading, United Kingdom
| | - Sirintra Sirivisoot
- Division of Dengue Hemorrhagic Fever Research, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Sophie Jegouic
- Reading School of Pharmacy, University of Reading, Whiteknights, Reading, United Kingdom
| | - Tanapan Prommool
- Molecular Biology of Dengue and Flaviviruses Research Team, Medical Molecular Biotechnology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, Thailand
| | - Prasit Luangaram
- Molecular Biology of Dengue and Flaviviruses Research Team, Medical Molecular Biotechnology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, Thailand
| | - Chatchawan Srisawat
- Department of Biochemistry, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Kanokwan Sriraksa
- Pediatric Department, Khon Kaen Hospital, Ministry of Health, Khon Kaen, Thailand
| | - Wannee Limpitikul
- Pediatric Department, Songkhla Hospital, Ministry of Health, Songkhla, Thailand
| | - Dumrong Mairiang
- Division of Dengue Hemorrhagic Fever Research, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
- Molecular Biology of Dengue and Flaviviruses Research Team, Medical Molecular Biotechnology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, Thailand
- Siriraj Center of Research Excellence in Dengue and Emerging Pathogens, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Prida Malasit
- Division of Dengue Hemorrhagic Fever Research, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
- Molecular Biology of Dengue and Flaviviruses Research Team, Medical Molecular Biotechnology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, Thailand
- Siriraj Center of Research Excellence in Dengue and Emerging Pathogens, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Panisadee Avirutnan
- Division of Dengue Hemorrhagic Fever Research, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
- Molecular Biology of Dengue and Flaviviruses Research Team, Medical Molecular Biotechnology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, Thailand
- Siriraj Center of Research Excellence in Dengue and Emerging Pathogens, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
- * E-mail: (PA); (CH); (ADE)
| | - Chunya Puttikhunt
- Division of Dengue Hemorrhagic Fever Research, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
- Molecular Biology of Dengue and Flaviviruses Research Team, Medical Molecular Biotechnology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, Thailand
- Siriraj Center of Research Excellence in Dengue and Emerging Pathogens, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
- * E-mail: (PA); (CH); (ADE)
| | - Alexander Daniel Edwards
- Reading School of Pharmacy, University of Reading, Whiteknights, Reading, United Kingdom
- Capillary Film Technology Ltd, Billingshurst, West Sussex, United Kingdom
- * E-mail: (PA); (CH); (ADE)
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Alidjinou EK, Tardieu S, Vrenken I, Hober D, Gourinat AC. Prospective Evaluation of a Commercial Dengue NS1 Antigen Rapid Diagnostic Test in New Caledonia. Microorganisms 2022; 10:microorganisms10020346. [PMID: 35208800 PMCID: PMC8879109 DOI: 10.3390/microorganisms10020346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/17/2022] [Accepted: 01/31/2022] [Indexed: 11/18/2022] Open
Abstract
Dengue virus infection is endemic in New Caledonia, with outbreaks occurring every year. We evaluated the Biosynex® Dengue NS1 antigen rapid diagnostic test (RDT) for the early diagnosis of dengue in patients attending a local hospital in northern New Caledonia. Samples collected from patients suspected of dengue infection were tested with RDT at the local laboratory, and then sent to the reference laboratory for confirmation with real-time RT-PCR. A total of 472 samples were included during the study period. RT-PCR yielded a positive result in 154 samples (32.6%). The sensitivity and specificity of the NS1 antigen RDT were 79.9% and 96.2%, respectively. The performance of the RDT varied by the time of sampling and dengue virus serotype. In conclusion, Biosynex® Dengue NS1 antigen RDT showed a sensitivity and a specificity in the upper range usually reported for this type of test. Several factors can lead to a suboptimal sensitivity, and negative samples with suggestive clinical features should be retested with reference methods.
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Affiliation(s)
- Enagnon Kazali Alidjinou
- Laboratoire de Virologie ULR3610, University of Lille, CHU Lille, F-59000 Lille, France;
- Microbiology Laboratory, Centre Hospitalier Territorial de Nouvelle-Calédonie, 98835 Dumbea, France;
- Correspondence: ; Tel.: +33-32-044-5480; Fax: +33-32-044-4895
| | - Sylvie Tardieu
- Laboratory Department, Centre Hospitalier du Nord, 98860 Kone, France; (S.T.); (I.V.)
| | - Isabelle Vrenken
- Laboratory Department, Centre Hospitalier du Nord, 98860 Kone, France; (S.T.); (I.V.)
| | - Didier Hober
- Laboratoire de Virologie ULR3610, University of Lille, CHU Lille, F-59000 Lille, France;
| | - Ann-Claire Gourinat
- Microbiology Laboratory, Centre Hospitalier Territorial de Nouvelle-Calédonie, 98835 Dumbea, France;
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Humaidi M, Tien WP, Yap G, Chua CR, Ng LC. Non-Invasive Dengue Diagnostics-The Use of Saliva and Urine for Different Stages of the Illness. Diagnostics (Basel) 2021; 11:diagnostics11081345. [PMID: 34441280 PMCID: PMC8393275 DOI: 10.3390/diagnostics11081345] [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: 05/27/2021] [Revised: 07/19/2021] [Accepted: 07/19/2021] [Indexed: 11/16/2022] Open
Abstract
Dengue diagnosis is largely dependent on clinical symptoms and routinely confirmed with laboratory detection of dengue virus in patient serum samples collected via phlebotomy. This presents a challenge to patients not amenable to venipuncture. Non-invasive methods of dengue diagnosis have the potential to enhance the current dengue detection algorithm. In this study, samples from dengue infected patients were collected between January 2012 until September 2012 and September 2013 until December 2013 in two different setups. Panel A samples (blood, urine, and saliva) were collected daily when the 39 patients were hospitalised and during their follow-up visits while Panel B samples (saliva) were collected from 23 patients during the acute stage of dengue. Using DENV PCR on Panel A, from day 2 to day 4 post fever onset, serum showed the best overall positivity followed by saliva and urine (100%/82.1%/67.9%). From day 5 until day 10 post fever onset, serum and urine had similar positivity (67.4%/61.2%), followed by saliva (51.3%). Beyond day 10 post fever onset, DENV was undetectable in sera, but urine and saliva showed 56.8% and 28.6% positivity, respectively. DENV in urine was detectable up until 32 days post fever. Panel B results showed overall sensitivity of 32.4%/36% (RNA/NS1) for DENV detection in saliva. Our results suggest that the urine-based detection method is useful especially for late dengue detection, where DENV is undetected in sera but still detectable in urine. This provides a potential tool for the physician to pick up new cases in an area where there is ongoing dengue transmission and subsequently prompt for intensified vector control activities.
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Affiliation(s)
- Mahathir Humaidi
- Environmental Health Institute, National Environment Agency, Singapore 138667, Singapore; (W.P.T.); (G.Y.); (C.R.C.)
- Correspondence: (M.H.); (L.C.N.)
| | - Wei Ping Tien
- Environmental Health Institute, National Environment Agency, Singapore 138667, Singapore; (W.P.T.); (G.Y.); (C.R.C.)
| | - Grace Yap
- Environmental Health Institute, National Environment Agency, Singapore 138667, Singapore; (W.P.T.); (G.Y.); (C.R.C.)
| | - Choon Rong Chua
- Environmental Health Institute, National Environment Agency, Singapore 138667, Singapore; (W.P.T.); (G.Y.); (C.R.C.)
| | - Lee Ching Ng
- Environmental Health Institute, National Environment Agency, Singapore 138667, Singapore; (W.P.T.); (G.Y.); (C.R.C.)
- School of Biological Science, Nanyang Technological University, Singapore 639798, Singapore
- Correspondence: (M.H.); (L.C.N.)
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Prabowo MH, Chatchen S, Rijiravanich P, Klamkam P, Chalermwatanachai T, Limkittikul K, Surareungchai W. Clinical evaluation of a developed paper-based Dengue NS1 rapid diagnostic test for febrile illness patients. Int J Infect Dis 2021; 107:271-277. [PMID: 33991681 DOI: 10.1016/j.ijid.2021.05.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 05/04/2021] [Accepted: 05/07/2021] [Indexed: 11/25/2022] Open
Abstract
OBJECTIVES This study aimed to evaluate a microfluidic paper-based analytical device (DEN-NS1-PAD) based on a rapid NS1 antigen test for diagnosing dengue at the point of care. METHODS 219 serum samples from suspected dengue cases were tested with the developed DEN-NS1-PAD and commercial RDT by SD BIOLINE. The results were compared with the nested-PCR results. RESULTS The limit of detection of DEN-NS1-PAD was 0.78 ng mL-1. It showed 88.89% sensitivity, 86.67% specificity, and a substantial agreement correlation (κ = 0.7522) compared with nested-PCR. In contrast, SD BIOLINE for NS1 (SD-NS1) detection showed 87.88% sensitivity, 90.00% specificity, and had a substantial agreement correlation with nested-PCR (κ = 0.7788). CONCLUSIONS DEN-NS1-PAD is a valuable tool for diagnosing DENV infections, especially for diagnosed patients with early acute phase samples with high viral load. DEN-NS1-PAD has better sensitivity than SD-NS1 but less specificity.
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Affiliation(s)
- Muhammad Hatta Prabowo
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bang Khun Thian, Bangkok 10150, Thailand; Department of Pharmacy, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Sleman, Yogyakarta, 55584, Indonesia
| | - Supawat Chatchen
- Department of Tropical Pediatrics, Faculty of Tropical Medicine, Mahidol University, Ratchathewi, Bangkok, 10400, Thailand
| | - Patsamon Rijiravanich
- Bioscience and System Biology Research Team, National Center for Genetic Engineering and Biotechnology, National Sciences and Technology Development Agency at King Mongkut's University of Technology Thonburi, Bang Khun Thian, Bangkok 10150, Thailand.
| | - Pana Klamkam
- Department of Otolaryngology, Phramongkutklao Hospital and College of Medicine, Ratchathewi, Bangkok 10400, Thailand
| | - Thanit Chalermwatanachai
- Department of Otolaryngology, Phramongkutklao Hospital and College of Medicine, Ratchathewi, Bangkok 10400, Thailand
| | - Kriengsak Limkittikul
- Department of Tropical Pediatrics, Faculty of Tropical Medicine, Mahidol University, Ratchathewi, Bangkok, 10400, Thailand
| | - Werasak Surareungchai
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bang Khun Thian, Bangkok 10150, Thailand.
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Kuo L, Jaeger AS, Banker EM, Bialosuknia SM, Mathias N, Payne AF, Kramer LD, Aliota MT, Ciota AT. Reversion to ancestral Zika virus NS1 residues increases competence of Aedes albopictus. PLoS Pathog 2020; 16:e1008951. [PMID: 33052957 PMCID: PMC7588074 DOI: 10.1371/journal.ppat.1008951] [Citation(s) in RCA: 6] [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: 05/12/2020] [Revised: 10/26/2020] [Accepted: 09/01/2020] [Indexed: 02/07/2023] Open
Abstract
Both mosquito species-specific differences and virus strain -specific differences impact vector competence. Previous results in our laboratory with individual populations of N. American mosquitoes support studies suggesting Aedes aegypti are more competent than Ae. albopictus for American Zika virus (ZIKV) strains and demonstrate that U.S. Ae. albopictus have higher competence for an ancestral Asian ZIKV strain. A982V, an amino acid substitution in the NS1 gene acquired prior to the American outbreak, has been shown to increase competence in Ae. aegypti. We hypothesized that variability in the NS1 could therefore contribute to species-specific differences and developed a reverse genetics system based on a 2016 ZIKV isolate from Honduras (ZIKV-WTic) to evaluate the phenotypic correlates of individual amino acid substitutions. In addition to A982V, we evaluated G894A, which was acquired during circulation in the Americas. Reversion of 982 and 894 to ancestral residues increased infectivity, transmissibility and viral loads in Ae. albopictus but had no effect on competence or replication in Ae. aegypti. In addition, while host cell-specific differences in NS1 secretion were measured, with significantly higher secretion in mammalian cells relative to mosquito cells, strain-specific differences in secretion were not detected, despite previous reports. These results demonstrate that individual mutations in NS1 can influence competence in a species-specific manner independent of differences in NS1 secretion and further indicate that ancestral NS1 residues confer increased competence in Ae. albopictus. Lastly, experimental infections of Ifnar1-/- mice demonstrated that these NS1 substitutions can influence viral replication in the host and, specifically, that G894A could represent a compensatory change following a fitness loss from A982V with some viral genetic backgrounds. Together these data suggest a possible role for epistatic interactions in ZIKV fitness in invertebrate and vertebrate hosts and demonstrate that strains with increased transmission potential in U.S. Ae. albopictus could emerge.
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Affiliation(s)
- Lili Kuo
- The Arbovirus Laboratory, Wadsworth Center, New York State Department of Health, Slingerlands, NY, United States of America
| | - Anna S. Jaeger
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, St. Paul, MN, United States of America
| | - Elyse M. Banker
- The Arbovirus Laboratory, Wadsworth Center, New York State Department of Health, Slingerlands, NY, United States of America
| | - Sean M. Bialosuknia
- The Arbovirus Laboratory, Wadsworth Center, New York State Department of Health, Slingerlands, NY, United States of America
| | - Nicholas Mathias
- The Arbovirus Laboratory, Wadsworth Center, New York State Department of Health, Slingerlands, NY, United States of America
| | - Anne F. Payne
- The Arbovirus Laboratory, Wadsworth Center, New York State Department of Health, Slingerlands, NY, United States of America
| | - Laura D. Kramer
- The Arbovirus Laboratory, Wadsworth Center, New York State Department of Health, Slingerlands, NY, United States of America
- Department of Biomedical Sciences, State University of New York at Albany School of Public Health, Albany, NY, United States of America
| | - Matthew T. Aliota
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, St. Paul, MN, United States of America
| | - Alexander T. Ciota
- The Arbovirus Laboratory, Wadsworth Center, New York State Department of Health, Slingerlands, NY, United States of America
- Department of Biomedical Sciences, State University of New York at Albany School of Public Health, Albany, NY, United States of America
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Detection of Dengue Virus-Specific IgM and IgG Antibodies through Peptide Sequences of Envelope and NS1 Proteins for Serological Identification. J Immunol Res 2020; 2020:1820325. [PMID: 32832567 PMCID: PMC7424411 DOI: 10.1155/2020/1820325] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 05/18/2020] [Accepted: 06/02/2020] [Indexed: 12/27/2022] Open
Abstract
Dengue is an acute febrile illness caused by positive-sense single-stranded RNA virus, belonging to the family Flaviviridae and genus Flavivirus. Transmission of virus among the individuals occurred by blood-feeding Aedes mosquitoes. This virus has four serotypes differentiated on the basis of antibody neutralization assay. At present, there is no particular treatment or vaccine candidate available for dengue infection. Approximately 3.9 billion human populations are at risk of dengue virus (DENV) infection. Thus, precise diagnosis of dengue at the early stage is very essential for disease control and effective therapy in order to treat or prevent severe complications. Indeed, the accurate diagnosis of DENV remains a problem because of low detection accuracy along with high testing price. Sensitivity and specificity of available kits vary from test to test, and cross-reactivity with other Flavivirus is a challenging issue for diagnosis. In this study, linear epitopes of envelope (E) and NS1 proteins were identified to diagnose the DENV. Whole protein sequences of E and NS1 of DENV were obtained from UniProtKB database. On the basis of algorithm prediction from DNASTAR, BCEPRED, and IEDB data resources, twelve peptides of E (EP1 to EP12) and eight peptides of NS1 (NS1-1 to NS1-8) were selected, which were common in all serotypes. Sequence homologies of peptides with other Flavivirus were checked by Multiple Sequence Alignment Tool ClustalX2. Peptide sequences were synthesized chemically by solid-phase peptide synthesis technique. Dengue-specific IgM and IgG (secondary response) antibodies in the patient's antisera were tested with the peptides using ELISA protocol. Peptides EP1, EP2, EP4, EP7, EP10, and EP12 of E protein and NS1-1, NS1-3, NS1-4, NS1-7, and NS1-8 of NS1 protein were considered the best immunoreactive peptides with the sensitivity (73.33-96.66%) and specificity (82.14-100%). Such peptides together can be used to construct the multiple antigen peptides (MAP) or multiplexed microbeads for designing a precise, cost-effective, and easy-to-make peptide-based immunodiagnostic kit for DENV detection.
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Mata VE, Andrade CAFD, Passos SRL, Hökerberg YHM, Fukuoka LVB, Silva SAD. Rapid immunochromatographic tests for the diagnosis of dengue: a systematic review and meta-analysis. CAD SAUDE PUBLICA 2020; 36:e00225618. [PMID: 32520127 DOI: 10.1590/0102-311x00225618] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2018] [Accepted: 02/18/2020] [Indexed: 11/22/2022] Open
Abstract
Dengue is an important arthropod-borne viral disease in terms of morbidity, mortality, economic impact and challenges in vector control. Benchmarks are expensive, time consuming and require trained personnel. Preventing dengue complications with rapid diagnosis has been based on the testing of easy-to-perform optimized immunochromatographic methods (ICT). This is a systematic meta-analysis review of the diagnostic accuracy of IgA, NS1, IgM and/or IgG ICT studies in suspected cases of acute or convalescent dengue, using a combination of RT-PCR, ELISA NS1, IgM IgG or viral isolation as a reference standard. This protocol was registered in PROSPERO (CRD42014009885). Two pairs of reviewers searched the PubMed, BIREME, Science Direct, Scopus, Web of Science, Ovid MEDLINE JBrigs, SCIRUS and EMBASE databases, selected, extracted, and quality-assessed by QUADAS 2. Of 3,783 studies, we selected 57, of which 40 in meta-analyses according to the analyte tested, with high heterogeneity (I2 > 90%), as expected for diagnostic tests. We detected higher pooled sensitivity in acute phase IgA (92.8%) with excellent (90%) specificity. ICT meta-analysis with NS1/IgM/IgG showed 91% sensitivity and 96% specificity. Poorer screening performance was for IgM/IgG ICT (sensitivity = 56%). Thus, the studies with NS1/IgM/IgG ICT showed the best combined performance in the acute phase of the disease.
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Darcy AW, Kanda S, Dalipanda T, Joshua C, Shimono T, Lamaningao P, Mishima N, Nishiyama T. Multiple arboviral infections during a DENV-2 outbreak in Solomon Islands. Trop Med Health 2020; 48:33. [PMID: 32435149 PMCID: PMC7225641 DOI: 10.1186/s41182-020-00217-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 04/23/2020] [Indexed: 11/15/2022] Open
Abstract
Background Solomon Islands, a country made up of tropical islands, has suffered cyclic dengue fever (DF) outbreaks in the past three decades. An outbreak of dengue-like illness (DLI) that occurred in April 2016 prompted this study, which aimed to determine the population’s immunity status and identify the arboviruses circulating in the country. Methods A household survey, involving 188 participants in two urban areas (Honiara and Gizo), and a parallel hospital-based clinical survey were conducted in April 2016. The latter was repeated in December after a surge in DLI cases. Arbovirus IgG ELISA were performed on the household blood samples to determine the prevalence of arboviruses in the community, while qPCR testing of the clinical samples was used to identify the circulating arboviruses. Dengue virus (DENV)-positive samples were further characterized by amplifying and sequencing the envelope gene. Results The overall prevalence rates of DENV, Zika virus, and chikungunya virus were 83.4%, 7.6%, and 0.9%, respectively. The qPCR positivity rates of the clinical samples collected in April 2016 were as follows: DENV 39.6%, Zika virus 16.7%, and chikungunya virus 6.3%, which increased to 74%, 48%, and 20% respectively in December 2016. The displacement of the circulating serotype-3, genotype-1, with DENV serotype 2, genotype cosmopolitan was responsible for the outbreak in 2016. Conclusions A DENV outbreak in Solomon Islands was caused by the introduction of a single serotype. The high prevalence of DENV provided transient cross-protection, which prevented the introduction of a new serotype from the hyperendemic region for at least 3 years. The severe outcomes seen in the recent outbreak probably resulted from changes in the causative viruses and the effects of population immunity and changes in the outbreak pattern. Solomon Islands needs to step up surveillance to include molecular tools, increase regional communication, and perform timely interventions.
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Mata VE, Passos SRL, Santos MABD, Buonora SN, de Andrade CAF, Lima MDRQ, Costa BM, Hökerberg YHM. Diagnostic parameters and reliability of four rapid immunochromatographic tests for dengue 4. Braz J Infect Dis 2020; 24:58-64. [PMID: 31954721 PMCID: PMC9392029 DOI: 10.1016/j.bjid.2019.12.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 12/09/2019] [Accepted: 12/15/2019] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Although performance of rapid immunochromatographic tests (RITs) for dengue virus (DENV) serotypes 1, 2 and 3 is relatively settled, evidence on accuracy of RITs for DENV-4 are based on studies with small sample sizes and with discrepant results. OBJECTIVES To assess accuracy and inter-observer agreement of RITs targeting dengue nonstructural protein-1 (NS1) antigen - Dengue NS1-Bioeasy™, Dengue NS1 Ag Strip-Bio-Rad™, IVB Dengue Ag NS1-Orangelife™ and Dengue NS1-K130-Bioclin™ in DENV-4 samples. METHODS Study sample (n = 324) included adults presenting at an emergency unit in Rio de Janeiro, Brazil, with fever of ≤72 h and two or more dengue symptoms. A serum sample from each patient was tested by each RIT. A positive reverse-transcription polymerase chain reaction was considered as the reference standard for dengue diagnosis. The diagnostic parameters analyzed for each RIT were sensitivity, specificity, positive and negative predictive values, and likelihood ratios. Each RIT was read by homogeneous (two junior nurses) or heterogeneous (one junior nurse and one senior biologist) pairs. Agreement was estimated by simple kappa with 95% confidence interval, positive (Ppos) and negative (Pneg) proportion concordance and prevalence and bias adjusted kappa, rated from poor (k < 0.0) to almost perfect (0.8 < k < 1.0), and perfect (k = 1). RESULTS NS1 RITs for DENV-4 diagnosis showed high specificity (95.9%-99.4%), but low sensitivity (14.7%-45.4%). Bioeasy™ had the best performance, with a positive likelihood ratio of 26.0 (95% CI: 8.4;81.0). Inter-observer agreement was almost perfect for all evaluated RITs. Mismatches in confirmed dengue were more common for the Bioclin™ (Ppos 88.3-90.0 %) and Orangelife™ (Ppos 91.7-94.1 %) tests. CONCLUSIONS For DENV-4, the tested RITs had high specificity, but lower sensitivity compared to published results for other serotypes. They should not be used for screening purposes. Different brands may have very different performances. This should be considered upon deciding of using RITs in DENV-4 outbreaks.
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Affiliation(s)
- Veronica Elizabeth Mata
- Oswaldo Cruz Foundation, Evandro Chagas National Institute of Infectious Diseases, Laboratory of Clinical Epidemiology, Rio de Janeiro, RJ, Brazil
| | - Sonia Regina Lambert Passos
- Oswaldo Cruz Foundation, Evandro Chagas National Institute of Infectious Diseases, Laboratory of Clinical Epidemiology, Rio de Janeiro, RJ, Brazil.
| | | | - Sibelle Nogueira Buonora
- Oswaldo Cruz Foundation, Evandro Chagas National Institute of Infectious Diseases, Laboratory of Clinical Epidemiology, Rio de Janeiro, RJ, Brazil
| | | | | | | | - Yara Hahr Marques Hökerberg
- Oswaldo Cruz Foundation, Evandro Chagas National Institute of Infectious Diseases, Laboratory of Clinical Epidemiology, Rio de Janeiro, RJ, Brazil
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Dhal A, Kalyani T, Ghorai S, Sahu NK, Jana SK. Recent development of electrochemical immunosensor for the diagnosis of dengue virus NSI protein: A review. SENSORS INTERNATIONAL 2020. [DOI: 10.1016/j.sintl.2020.100030] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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Secretion of Nonstructural Protein 1 of Dengue Virus from Infected Mosquito Cells: Facts and Speculations. J Virol 2018; 92:JVI.00275-18. [PMID: 29720514 DOI: 10.1128/jvi.00275-18] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Dengue virus nonstructural protein 1 (NS1) is a multifunctional glycoprotein. For decades, the notion in the field was that NS1 is secreted exclusively from vertebrate cells and not from mosquito cells. However, recent evidence shows that mosquito cells also secrete NS1 efficiently. In this review, we discuss the evidence for secretion of NS1 of dengue virus, and of other flaviviruses, from mosquito cells, differences between NS1 secreted from mosquito and NS1 secreted from vertebrate cells, and possible roles of soluble NS1 in the insect flavivirus vector.
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Validation of the Pockit Dengue Virus Reagent Set for Rapid Detection of Dengue Virus in Human Serum on a Field-Deployable PCR System. J Clin Microbiol 2018; 56:JCM.01865-17. [PMID: 29436418 DOI: 10.1128/jcm.01865-17] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 01/30/2018] [Indexed: 01/05/2023] Open
Abstract
Dengue virus (DENV) infection, a mosquito-borne disease, is a major public health problem in tropical countries. Point-of-care DENV detection with good sensitivity and specificity enables timely early diagnosis of DENV infection, facilitating effective disease management and control, particularly in regions of low resources. The Pockit dengue virus reagent set (GeneReach Biotech), a reverse transcription insulated isothermal PCR (RT-iiPCR), is available to detect all four serotypes of DENV on the field-deployable Pockit system, which is ready for on-site applications. In this study, analytical and clinical performances of the assay were evaluated. The index assay did not react with 14 non-DENV human viruses, indicating good specificity. Compared to the U.S. CDC DENV-1-4 real-time quantitative RT-PCR (qRT-PCR) assay, testing with serial dilutions of virus-spiked human sera demonstrated that the index assay had detection endpoints that were separately comparable with the 4 serotypes. Excellent reproducibility was observed among repeat tests done by six operators at three sites. In clinical performance, 195 clinical sera collected around Kaohsiung city in 2012 and 21 DENV-4-spiked sera were tested with the RT-iiPCR and qRT-PCR assays in parallel. The 121 (11 DENV-1, 78 DENV-2, 11 DENV-3, and 21 DENV-4) qRT-PCR-positive and 95 qRT-PCR-negative samples were all positive and negative by the RT-iiPCR reagent results, respectively, demonstrating high (100%) interrater agreement (95% confidence interval [CI95%], ∼98.81% to 100%; κ = 1). With analytical and clinical performance equivalent to those of the reference qRT-PCR assay, the index PCR assay on the field-deployable system can serve as a highly sensitive and specific on-site tool for DENV detection.
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Alcalá AC, Hernández-Bravo R, Medina F, Coll DS, Zambrano JL, del Angel RM, Ludert JE. The dengue virus non-structural protein 1 (NS1) is secreted from infected mosquito cells via a non-classical caveolin-1-dependent pathway. J Gen Virol 2017; 98:2088-2099. [DOI: 10.1099/jgv.0.000881] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
Affiliation(s)
- Ana C. Alcalá
- Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Cuernavaca, Morelos, Mexico
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), CDMX, Mexico
| | - Raiza Hernández-Bravo
- Exploration and Production Research Office, Mexican Petroleum Institute (IMP), Mexico City, Mexico
| | - Fernando Medina
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), CDMX, Mexico
| | - David S. Coll
- Center of Chemistry, Venezuelan Institute for Scientific Research (IVIC), Caracas, Venezuela
| | - Jose L. Zambrano
- Center of Microbiology and Cell Biology, Venezuelan Institute for Scientific Research (IVIC), Caracas, Venezuela
| | - Rosa M. del Angel
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), CDMX, Mexico
| | - Juan E. Ludert
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), CDMX, Mexico
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Alcalá AC, Medina F, González-Robles A, Salazar-Villatoro L, Fragoso-Soriano RJ, Vásquez C, Cervantes-Salazar M, del Angel RM, Ludert JE. The dengue virus non-structural protein 1 (NS1) is secreted efficiently from infected mosquito cells. Virology 2016; 488:278-87. [DOI: 10.1016/j.virol.2015.11.020] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 11/19/2015] [Indexed: 02/06/2023]
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Chen X, Chen R, Gu W, He J, Cai W, Li J, Duan C, Yan H. Clinical evaluation of dengue RNA, NS1, and IgM for diagnosis of dengue in Southern China. J Med Virol 2015; 88:28-34. [PMID: 26118588 DOI: 10.1002/jmv.24314] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/25/2015] [Indexed: 11/05/2022]
Abstract
In 2014, a large outbreak of dengue occurred in Guangzhou, China. This outbreak prompted us to evaluate NS1 and RNA for the early diagnosis of acute dengue infection, in addition to the combination with IgM antibody. We aimed to find the differences of three assays about dengue diagnosis. This study was an evaluation of diagnosis test. Based on WHO criteria 2009, dengue RNA, NS1, and IgM/IgG were detected from 294 patients (180 dengue patients, 114 non-dengue patients) by three diagnostic kits made in China. The χ(2) test, sensitivity, and specificity were used in statistical analysis. The ratios of dengue patients with low platelet counts (<100 × 10(9) /L 32.2%) or white blood cell counts (<4.0 × 10(9) /L 58.9%) were significantly higher compared to non-dengue patients (P < 0.05). Dengue NS1 was shown sensitive (93.9%) for diagnostic use. RNA had a better performance with 98.1% of sensitivity from day 1 to day 4 after illness onset. IgM performed better at day 5 or more with 74.0% of sensitivity. The diagnostic rate using a combination of RNA and IgM was 97.8% and 96.7% using NS1 and IgM. A patient with low platelet and white blood cell counts needs additional tests for dengue during an epidemic. RNA and NS1 were most valuable for early diagnosis of dengue, whereas IgM was best suited as a supplementary method for patients at day 5 or more after illness onset.
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Affiliation(s)
- Xinliang Chen
- Department of Clinical Laboratory, Sun Yat-Sen Memorial Hospital, Guangzhou, Guangdon, P.R. China
| | - Rui Chen
- Department of Respiratory Medicine, Sun Yat-Sen Memorial Hospital, Guangzhou, Guangdong, P.R. China
| | - Wenshen Gu
- Department of Clinical Laboratory, Sun Yat-Sen Memorial Hospital, Guangzhou, Guangdon, P.R. China
| | - Jian He
- Department of Clinical Laboratory, Sun Yat-Sen Memorial Hospital, Guangzhou, Guangdon, P.R. China
| | - Weipeng Cai
- Department of Clinical Laboratory, Sun Yat-Sen Memorial Hospital, Guangzhou, Guangdon, P.R. China
| | - Jiajia Li
- Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China
| | - Chaohui Duan
- Department of Clinical Laboratory, Sun Yat-Sen Memorial Hospital, Guangzhou, Guangdon, P.R. China
| | - Haiyan Yan
- Department of Clinical Laboratory, Sun Yat-Sen Memorial Hospital, Guangzhou, Guangdon, P.R. China
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De La Cruz Hernández SI, Reyes-del Valle J, Villegas-del Angel E, Ludert JE, del Angel RM. Dengue laboratory diagnosis: still some room for improvement. Future Virol 2015. [DOI: 10.2217/fvl.15.59] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dengue is the most important and widely distributed arthropod-borne viral disease affecting humans. The number of dengue virus infections has steadily grown and more than 100 countries survey dengue incidence every year. Due to the lack of an approved antiviral treatment or licensed preventative vaccine, accurate and opportune diagnosis is commended for efficient dengue epidemiological surveillance, to propose control measures in order to curtail outbreaks timely and treat patients satisfactorily. In this review, the basis, application and indications for different diagnostic tests are described, and their advantages and limitations considered. At the end of this piece, we speculate what the future may hold for the diagnosis of dengue infections.
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Affiliation(s)
- Sergio Isaac De La Cruz Hernández
- Department of Virology, Instituto de Diagnóstico y Referencia Epidemiológicos (InDRE), Mexico
- Departament of Infectomics & Molecular Pathogenesis, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), D.F., Mexico
| | | | | | - Juan E Ludert
- Departament of Infectomics & Molecular Pathogenesis, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), D.F., Mexico
| | - Rosa M del Angel
- Departament of Infectomics & Molecular Pathogenesis, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), D.F., Mexico
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Tuan NM, Nhan HT, Chau NVV, Hung NT, Tuan HM, Tram TV, Ha NLD, Loi P, Quang HK, Kien DTH, Hubbard S, Chau TNB, Wills B, Wolbers M, Simmons CP. Sensitivity and specificity of a novel classifier for the early diagnosis of dengue. PLoS Negl Trop Dis 2015; 9:e0003638. [PMID: 25836753 PMCID: PMC4383489 DOI: 10.1371/journal.pntd.0003638] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 02/23/2015] [Indexed: 11/19/2022] Open
Abstract
Background Dengue is the commonest arboviral disease of humans. An early and accurate diagnosis of dengue can support clinical management, surveillance and disease control and is central to achieving the World Health Organisation target of a 50% reduction in dengue case mortality by 2020. Methods 5729 children with fever of <72hrs duration were enrolled into this multicenter prospective study in southern Vietnam between 2010-2012. A composite of gold standard diagnostic tests identified 1692 dengue cases. Using statistical methods, a novel Early Dengue Classifier (EDC) was developed that used patient age, white blood cell count and platelet count to discriminate dengue cases from non-dengue cases. Results The EDC had a sensitivity of 74.8% (95%CI: 73.0-76.8%) and specificity of 76.3% (95%CI: 75.2-77.6%) for the diagnosis of dengue. As an adjunctive test alongside NS1 rapid testing, sensitivity of the composite test was 91.6% (95%CI: 90.4-92.9%). Conclusions We demonstrate that the early diagnosis of dengue can be enhanced beyond the current standard of care using a simple evidence-based algorithm. The results should support patient management and clinical trials of specific therapies. Dengue is a very common acute infectious disease in the tropical world. Health care professionals are able to better care for dengue patients if they can make an early diagnosis and make a plan for case management. This current study investigated fever in 5729 children in Vietnam with 3 days or less of fever and identified 1692 dengue cases using advanced, gold standard methods. We systematically collected a range of medical and laboratory findings on each patient when they entered the study and used statistical tools to determine if these medical and laboratory findings could enable early diagnosis, independent of sophisticated, gold-standard laboratory tests. Our results, called the Early Dengue Classifier, had performance characteristics suggesting it could improve the diagnostic proficiency of health care professionals. However the performance of the Early Dengue Classifier is not perfect and likely will not change the practice of experienced doctors in dengue endemic settings. Our study highlights the need for 2nd generation, easy-to-use rapid diagnostic tests that can accurately diagnose dengue in the first few days of fever.
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Affiliation(s)
| | - Ho Thi Nhan
- Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam
| | | | | | - Ha Manh Tuan
- Children’s Hospital No. 2, Ho Chi Minh City, Vietnam
| | - Ta Van Tram
- Tien Giang Provincial Hospital, My Tho, Tien Giang Province, Vietnam
| | - Nguyen Le Da Ha
- Dong Nai Children’s Hospital, Bien Hoa, Dong Nai Province, Vietnam
| | - Phan Loi
- Long An Provincial Hospital, Tan An, Long An Province, Vietnam
| | - Han Khoi Quang
- Binh Duong Provincial Hospital, Thu Dau Mot, Binh Duong Province, Vietnam
| | - Duong Thi Hue Kien
- Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam
| | - Sonya Hubbard
- Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia
| | - Tran Nguyen Bich Chau
- Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam
| | - Bridget Wills
- Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam
- Centre for Tropical Medicine, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Marcel Wolbers
- Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam
- Centre for Tropical Medicine, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Cameron P. Simmons
- Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam
- Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia
- Centre for Tropical Medicine, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
- Nossal Institute of Global Health, University of Melbourne, Parkville, Victoria, Australia
- * E-mail:
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Alm E, Lesko B, Lindegren G, Ahlm C, Söderholm S, Falk KI, Lagerqvist N. Universal single-probe RT-PCR assay for diagnosis of dengue virus infections. PLoS Negl Trop Dis 2014; 8:e3416. [PMID: 25522325 PMCID: PMC4270494 DOI: 10.1371/journal.pntd.0003416] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 11/13/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Dengue is a mosquito-borne viral disease that has become more prevalent in the last few decades. Most patients are viremic when they present with symptoms, and early diagnosis of dengue is important in preventing severe clinical complications associated with this disease and also represents a key factor in differential diagnosis. Here, we designed and validated a hydrolysis-probe-based one-step real-time RT-PCR assay that targets the genomes of dengue virus serotypes 1-4. METHODOLOGY/PRINCIPAL FINDINGS The primers and probe used in our RT-PCR assay were designed to target the 3' untranslated region of all complete genome sequences of dengue virus available in GenBank (n = 3,305). Performance of the assay was evaluated using in vitro transcribed RNA, laboratory-adapted virus strains, external control panels, and clinical specimens. The linear dynamic range was found to be 104-1011 GCE/mL, and the detection limit was between 6.0×102 and 1.1×103 GCE/mL depending on target sequence. The assay did not cross-react with human RNA, nor did it produce false-positive results for other human pathogenic flaviviruses or clinically important etiological agents of febrile illnesses. We used clinical serum samples obtained from returning travelers with dengue-compatible symptomatology (n = 163) to evaluate the diagnostic relevance of our assay, and laboratory diagnosis performed by the RT-PCR assay had 100% positive agreement with diagnosis performed by NS1 antigen detection. In a retrospective evaluation including 60 archived serum samples collected from confirmed dengue cases 1-9 days after disease onset, the RT-PCR assay detected viral RNA up to 9 days after appearance of symptoms. CONCLUSIONS/SIGNIFICANCE The validation of the RT-PCR assay presented here indicates that this technique can be a reliable diagnostic tool, and hence we suggest that it be introduced as the method of choice during the first 5 days of dengue symptoms.
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Affiliation(s)
- Erik Alm
- Department of Microbiology, Public Health Agency of Sweden, Solna, Sweden
| | - Birgitta Lesko
- Department of Microbiology, Public Health Agency of Sweden, Solna, Sweden
- Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Gunnel Lindegren
- Department of Microbiology, Public Health Agency of Sweden, Solna, Sweden
| | - Clas Ahlm
- Department of Clinical Microbiology, Umeå University, Umeå, Sweden
| | - Sandra Söderholm
- Department of Microbiology, Public Health Agency of Sweden, Solna, Sweden
| | - Kerstin I. Falk
- Department of Microbiology, Public Health Agency of Sweden, Solna, Sweden
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Nina Lagerqvist
- Department of Microbiology, Public Health Agency of Sweden, Solna, Sweden
- Department of Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden
- * E-mail:
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Cabrera-Romo S, Recio-Tótoro B, Alcalá AC, Lanz H, del Ángel RM, Sánchez-Cordero V, Rodríguez-Moreno Á, Ludert JE. Experimental inoculation of Artibeus jamaicensis bats with dengue virus serotypes 1 or 4 showed no evidence of sustained replication. Am J Trop Med Hyg 2014; 91:1227-34. [PMID: 25311698 PMCID: PMC4257650 DOI: 10.4269/ajtmh.14-0361] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 08/06/2014] [Indexed: 11/07/2022] Open
Abstract
Dengue is the most important mosquito-borne viral disease to humans. Bats are potential reservoirs for flaviviruses, including dengue virus (DENV). In this work, Artibeus jamaicensis bats were inoculated with two serotypes of DENV using different routes. For experimental inoculations (EI) 1 and 2, bats were inoculated subcutaneously or intraperitoneally with DENV-4; for EI-3 bats were inoculated intraperitoneally with DENV-1. Mock inoculated bats were kept as controls. In EI-4, bats were bitten by Aedes aegypti mosquitoes infected with DENV-1 or 4. Reverse transcription-polymerase chain reaction assays in plasma and spleen tissue collected from Day 1 to Days 9-17 after inoculation failed to reveal the presence of viral RNA in any of the samples. No evidence of circulating NS1 or specific anti-DENV IgG was detected in the plasma of the inoculated bats. These results indicate that A. jamaicensis bats are incapable of sustaining dengue virus replication and are unlikely to act as reservoirs for this virus.
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Affiliation(s)
- Salomé Cabrera-Romo
- Departament of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City, Mexico; Center for Research on Infectious Diseases (CISEI), National Institute of Public Health (INSP), Cuernavaca, Mexico; Institute of Biology, Mexico City, Universidad Nacional Autónoma de México, Mexico
| | - Benito Recio-Tótoro
- Departament of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City, Mexico; Center for Research on Infectious Diseases (CISEI), National Institute of Public Health (INSP), Cuernavaca, Mexico; Institute of Biology, Mexico City, Universidad Nacional Autónoma de México, Mexico
| | - Ana C Alcalá
- Departament of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City, Mexico; Center for Research on Infectious Diseases (CISEI), National Institute of Public Health (INSP), Cuernavaca, Mexico; Institute of Biology, Mexico City, Universidad Nacional Autónoma de México, Mexico
| | - Humberto Lanz
- Departament of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City, Mexico; Center for Research on Infectious Diseases (CISEI), National Institute of Public Health (INSP), Cuernavaca, Mexico; Institute of Biology, Mexico City, Universidad Nacional Autónoma de México, Mexico
| | - Rosa María del Ángel
- Departament of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City, Mexico; Center for Research on Infectious Diseases (CISEI), National Institute of Public Health (INSP), Cuernavaca, Mexico; Institute of Biology, Mexico City, Universidad Nacional Autónoma de México, Mexico
| | - Victor Sánchez-Cordero
- Departament of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City, Mexico; Center for Research on Infectious Diseases (CISEI), National Institute of Public Health (INSP), Cuernavaca, Mexico; Institute of Biology, Mexico City, Universidad Nacional Autónoma de México, Mexico
| | - Ángel Rodríguez-Moreno
- Departament of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City, Mexico; Center for Research on Infectious Diseases (CISEI), National Institute of Public Health (INSP), Cuernavaca, Mexico; Institute of Biology, Mexico City, Universidad Nacional Autónoma de México, Mexico
| | - Juan E Ludert
- Departament of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City, Mexico; Center for Research on Infectious Diseases (CISEI), National Institute of Public Health (INSP), Cuernavaca, Mexico; Institute of Biology, Mexico City, Universidad Nacional Autónoma de México, Mexico
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Pal S, Dauner AL, Mitra I, Forshey BM, Garcia P, Morrison AC, Halsey ES, Kochel TJ, Wu SJL. Evaluation of dengue NS1 antigen rapid tests and ELISA kits using clinical samples. PLoS One 2014; 9:e113411. [PMID: 25412170 PMCID: PMC4239072 DOI: 10.1371/journal.pone.0113411] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 10/23/2014] [Indexed: 11/18/2022] Open
Abstract
Background Early diagnosis of dengue virus (DENV) infection can improve clinical outcomes by ensuring close follow-up, initiating appropriate supportive therapies and raising awareness to the potential of hemorrhage or shock. Non-structural glycoprotein-1 (NS1) has proven to be a useful biomarker for early diagnosis of dengue. A number of rapid diagnostic tests (RDTs) and enzyme-linked immunosorbent assays (ELISAs) targeting NS1 antigen (Ag) are now commercially available. Here we evaluated these tests using a well-characterized panel of clinical samples to determine their effectiveness for early diagnosis. Methodology/Principal Findings Retrospective samples from South America were used to evaluate the following tests: (i) “Dengue NS1 Ag STRIP” and (ii) “Platelia Dengue NS1 Ag ELISA” (Bio-Rad, France), (iii) “Dengue NS1 Detect Rapid Test (1st Generation)” and (iv) “DENV Detect NS1 ELISA” (InBios International, United States), (v) “Panbio Dengue Early Rapid (1st generation)” (vi) “Panbio Dengue Early ELISA (2nd generation)” and (vii) “SD Bioline Dengue NS1 Ag Rapid Test” (Alere, United States). Overall, the sensitivity of the RDTs ranged from 71.9%–79.1% while the sensitivity of the ELISAs varied between 85.6–95.9%, using virus isolation as the reference method. Most tests had lower sensitivity for DENV-4 relative to the other three serotypes, were less sensitive in detecting secondary infections, and appeared to be most sensitive on Day 3–4 post symptom onset. The specificity of all evaluated tests ranged from 95%–100%. Conclusions ELISAs had greater overall sensitivity than RDTs. In conjunction with other parameters, the performance data can help determine which dengue diagnostics should be used during the first few days of illness, when the patients are most likely to present to a clinic seeking care.
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Affiliation(s)
- Subhamoy Pal
- Naval Medical Research Center, Silver Spring, Maryland 20910-7500, United States of America
- * E-mail:
| | - Allison L. Dauner
- Naval Medical Research Center, Silver Spring, Maryland 20910-7500, United States of America
| | - Indrani Mitra
- Naval Medical Research Center, Silver Spring, Maryland 20910-7500, United States of America
| | | | - Paquita Garcia
- Peruvian Ministry of Health, Instituto Nacional de Salud, Lima, Peru
| | - Amy C. Morrison
- U.S. Naval Medical Research Unit, No. 6, Lima, Peru
- University of California Davis, Davis, CA, 95616, United States of America
| | | | - Tadeusz J. Kochel
- Naval Medical Research Center, Silver Spring, Maryland 20910-7500, United States of America
| | - Shuenn-Jue L. Wu
- Naval Medical Research Center, Silver Spring, Maryland 20910-7500, United States of America
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Hermann LL, Thaisomboonsuk B, Poolpanichupatam Y, Jarman RG, Kalayanarooj S, Nisalak A, Yoon IK, Fernandez S. Evaluation of a dengue NS1 antigen detection assay sensitivity and specificity for the diagnosis of acute dengue virus infection. PLoS Negl Trop Dis 2014; 8:e3193. [PMID: 25275493 PMCID: PMC4183466 DOI: 10.1371/journal.pntd.0003193] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 08/17/2014] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Currently, no dengue NS1 detection kit has regulatory approval for the diagnosis of acute dengue fever. Here we report the sensitivity and specificity of the InBios DEN Detect NS1 ELISA using a panel of well characterized human acute fever serum specimens. METHODOLOGY/PRINCIPAL FINDINGS The InBios DENV Detect NS1 ELISA was tested using a panel composed of 334 serum specimens collected from acute febrile patients seeking care in a Bangkok hospital in 2010 and 2011. Of these patients, 314 were found to have acute dengue by either RT-PCR and/or anti-dengue IgM/IgG ELISA. Alongside the InBios NS1 ELISA kit, we compared the performance characteristics of the BioRad Platelia NS1 antigen kit. The InBios NS1 ELISA Ag kit had a higher overall sensitivity (86% vs 72.8%) but equal specificity (100%) compared to the BioRad Platelia kit. The serological status of the patient significantly influenced the outcome. In primary infections, the InBios NS1 kit demonstrated a higher sensitivity (98.8%) than in secondary infections (83.5%). We found significant variation in the sensitivity of the InBios NS1 ELISA kit depending on the serotype of the dengue virus and also found decreasing sensitivity the longer after the onset of illness, showing 100% sensitivity early during illness, but dropping below 50% by Day 7. CONCLUSION/SIGNIFICANCE The InBios NS1 ELISA kit demonstrated high accuracy when compared to the initial clinical diagnosis with greater than 85% agreement when patients were clinically diagnosed with dengue illness. Results presented here suggest the accurate detection of circulating dengue NS1 by the InBios DENV Detect NS1 ELISA can provide clinicians with a useful tool for diagnosis of early dengue infections.
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Affiliation(s)
- Laura L. Hermann
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada
- Department of Virology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Butsaya Thaisomboonsuk
- Department of Virology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | | | - Richard G. Jarman
- Viral Diseases Branch, Walter Reed Army Institute of Research, Washington D.C., United States of America
| | | | - Ananda Nisalak
- Department of Virology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - In-Kyu Yoon
- Department of Virology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Stefan Fernandez
- Department of Virology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
- * E-mail:
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Mishra B, Gupta PK, Dhiman V, Pujhari SK, Sharma M, Ratho RK. Clinical applicability of various dengue diagnostic tests in resource-limited endemic settings. J Glob Infect Dis 2014; 6:109-13. [PMID: 25191051 PMCID: PMC4147419 DOI: 10.4103/0974-777x.138504] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Introduction: Dengue is one of the most important arboviral infections caused by one of the four dengue serotypes, 1-4. Objective: To study the applicability of different diagnostic methods in diagnosis of dengue viral infection. Materials and Methods: A total of 2101 blood samples were collected for confirmation of dengue viral infection. All the samples were tested by dengue-specific IgM ELISA, of which 111 were also tested for NS1 antigen detection and 27 acute samples (≤5 days) were further subjected for viral RNA detection by RT-PCR and isolation in C6/36 cell line. To detect the sensitivity of NS1 antigen for different dengue virus serotypes, four dengue serotype 1 and 12 dengue 3 were subjected for the NS1 antigen assay. Results: Most common age group affected was 16-45 years, with male to female ratio of 2.8:1. During first 3 days of illness virus isolation and RT-PCR were the most sensitive (83%) followed by NS1 antigen detection (75%) and IgM detection (37.5%). The positivity of IgM detection was found to be significantly higher as compared to NS1 detection during 4 to 5 days and also after 5 days of illness (P < 0.05). Dengue serotypes 1 and 3 were found to be co-circulated, dengue 1 being the predominant serotype. Conclusion: Virus isolation and RT-PCR were the most sensitive tests during the early period of illness whereas beyond third day, IgM antibody detection was found to be the most sensitive method of dengue diagnosis.
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Affiliation(s)
- Baijayantimala Mishra
- Department of Virology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Puneet K Gupta
- Department of Virology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Vandana Dhiman
- Department of Virology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Sujit K Pujhari
- Department of Virology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Mirnalini Sharma
- Department of Virology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Radha K Ratho
- Department of Virology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
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Bragança CRS, Colombo LT, Roberti AS, Alvim MCT, Cardoso SA, Reis KCP, de Paula SO, da Silveira WB, Passos FML. Construction of recombinant Kluyveromyces marxianus UFV-3 to express dengue virus type 1 nonstructural protein 1 (NS1). Appl Microbiol Biotechnol 2014; 99:1191-203. [PMID: 25085614 DOI: 10.1007/s00253-014-5963-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 07/15/2014] [Accepted: 07/16/2014] [Indexed: 10/25/2022]
Abstract
The yeast Kluyveromyces marxianus is a convenient host for industrial synthesis of biomolecules. However, despite its potential, there are few studies reporting the expression of heterologous proteins using this yeast. Here, we report expression of a dengue virus protein in K. marxianus for the first time. The dengue virus type 1 nonstructural protein 1 (NS1) was integrated into the K. marxianus UFV-3 genome at the LAC4 locus using an adapted integrative vector designed for high-level expression of recombinant protein in Kluyveromyces lactis. The NS1 gene sequence was codon-optimized to increase the level of protein expression in yeast. The synthetic gene was cloned in frame with K. lactis α-mating factor signal peptide, and the recombinant plasmid obtained was used to transform K. marxianus UFV-3 by electroporation. The transformed cells, selected in yeast extract peptone dextrose containing 200 μg mL(-1) Geneticin, were mitotically stable. Analysis of recombinant strains by RT-PCR and protein detection using blot analysis confirmed both transcription and expression of extracellular NS1 polypeptide. After induction with galactose, the NS1 protein was analyzed by sodium dodecyl sulfate-PAGE and immunogenic detection. Protein production was investigated under two conditions: with galactose and biotin pulses at 24-h intervals during 96 h of induction and without galactose and biotin supplementation. Protease activity was not detected in post-growth medium. Our results indicate that recombinant K. marxianus is a good host for the production of dengue virus NS1 protein, which has potential for diagnostic applications.
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Affiliation(s)
- Caio Roberto Soares Bragança
- Laboratório de Fisiologia de Micro-organismos, Departamento de Microbiologia, BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG, Brazil
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28
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Zhang H, Li W, Wang J, Peng H, Che X, Chen X, Zhou Y. NS1-based tests with diagnostic utility for confirming dengue infection: a meta-analysis. Int J Infect Dis 2014; 26:57-66. [PMID: 24984164 DOI: 10.1016/j.ijid.2014.02.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 01/29/2014] [Accepted: 02/04/2014] [Indexed: 12/11/2022] Open
Abstract
OBJECTIVES Non-structural protein 1 (NS1)-based tests may offer a larger window of opportunity for dengue diagnosis and could constitute a very useful diagnostic tool. The aim of this study was to establish the overall accuracy of NS1-based tests for diagnosing dengue infection. METHODS A meta-analysis was conducted including 18 studies published up to October 1, 2012 identified using PubMed, ISI Web of Science, Google Scholar, and the Chinese National Knowledge Infrastructure (CNKI) database. RESULTS For the single NS1-based tests - ELISA (Panbio Dengue Early ELISA Kit, Dengue NS1 Ag ELISA Kit, and Platelia Dengue NS1 Ag-ELISA Kit) and immunochromatography (Dengue NS1 Ag STRIP Kit and SD BIOLINE Dengue Duo Strip Kit) - the summarized sensitivities and specificities were 67% (95% confidence interval (CI) 59-74%) and 99% (95% CI 97-99%), and 71% (95% CI 61-79%) and 99% (95% CI 98-100%), respectively. The hierarchical summary receiver operating characteristics (HSROCs) were 0.92 and 0.96, respectively. For NS1 combined with an anti-dengue-specific IgM test, the summarized sensitivity, specificity, and HSROC were 83% (95% CI 68-92%), 86% (95% CI 79-91%), and 0.91 (95% CI 0.89-0.93), respectively. The accuracy for serotypes was 50.0-90.9% for DENV-1, 38.5-85.7% for DENV-2, 46.7-91.3% for DENV-3, and 21.7-87.0% for DENV-4. CONCLUSIONS These results support the use of single NS1-based tests; they have good diagnostic utility for confirming dengue and for distinguishing serotypes DENV-1 and 3 from DENV-2 and 4, while they can be used as a screening tool when combined with an IgM test. Moreover, the Dengue NS1 Ag STRIP Kit appears to be the best for confirming and serotyping dengue infection.
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Affiliation(s)
- Hao Zhang
- Department of Infectious Diseases and Hepatology Unit, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, China; Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Province, School of Public Health and Tropical Medicine, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, China
| | - Wei Li
- Department of Infectious Diseases and Hepatology Unit, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, China
| | - Junjie Wang
- Department of Infectious Diseases and Hepatology Unit, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, China
| | - Hongjuan Peng
- Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Province, School of Public Health and Tropical Medicine, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, China
| | - Xiaoyan Che
- Center for Clinical Laboratory, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Xiaoguang Chen
- Key Laboratory of Prevention and Control for Emerging Infectious Diseases of Guangdong Province, School of Public Health and Tropical Medicine, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, China.
| | - Yuanping Zhou
- Department of Infectious Diseases and Hepatology Unit, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, China.
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NS1 antigen detecting assays for diagnosing acute dengue infection in people living in or returning from endemic countries. Hippokratia 2014. [DOI: 10.1002/14651858.cd011155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Fatima A, Wang H, Kang K, Xia L, Wang Y, Ye W, Wang J, Wang X. Development of VHH antibodies against dengue virus type 2 NS1 and comparison with monoclonal antibodies for use in immunological diagnosis. PLoS One 2014; 9:e95263. [PMID: 24751715 PMCID: PMC3994031 DOI: 10.1371/journal.pone.0095263] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 03/25/2014] [Indexed: 11/22/2022] Open
Abstract
The possibility of using variable domain heavy-chain antibodies (VHH antibodies) as diagnostic tools for dengue virus (DENV) type 2 NS1 protein was investigated and compared with the use of conventional monoclonal antibodies. After successful expression of DENV type 2 NS1 protein, the genes of VHH antibodies against NS1 protein were biopanned from a non-immune llama library by phage display. VHH antibodies were then expressed and purified from Escherichia coli. Simultaneously, monoclonal antibodies were obtained by the conventional route. Sequence analysis of the VHH antibodies revealed novel and long complementarity determining regions 3 (CDR3). Epitope mapping was performed via a phage display peptide library using purified VHH and monoclonal antibodies as targets. Interestingly, the same region of NS1, which comprises amino acids 224HWPKPHTLW232, was conserved for both kinds of antibodies displaying the consensus motif histidine-tryptophan-tryptophan or tryptophan-proline-tryptophan. The two types of antibodies were used to prepare rapid diagnostic kits based on immunochromatographic assay. The VHH antibody immobilized rapid diagnostic kit showed better sensitivity and specificity than the monoclonal antibody immobilized rapid diagnostic kit, which might be due to the long CDR3 regions of the VHH antibodies and their ability to bind to the pocket and cleft of the targeted antigen. This demonstrates that VHH antibodies are likely to be an option for developing point-of-care tests against DENV infection.
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Affiliation(s)
- Aneela Fatima
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, PR China
| | - Haiying Wang
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, PR China
| | - Keren Kang
- Guangzhou Wondfo Biotech Co., Ltd, Scientific City, Guangzhou, PR China
| | - Liliang Xia
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, Chinese National Human Genome Center at Shanghai, Shanghai, PR China
| | - Ying Wang
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, Chinese National Human Genome Center at Shanghai, Shanghai, PR China
| | - Wei Ye
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, PR China
| | - Jufang Wang
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, PR China
- * E-mail:
| | - Xiaoning Wang
- Institute of Life Science, General Hospital of The People’s Liberation Army, Beijing, PR China
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da Costa VG, Marques-Silva AC, Moreli ML. A meta-analysis of the diagnostic accuracy of two commercial NS1 antigen ELISA tests for early dengue virus detection. PLoS One 2014; 9:e94655. [PMID: 24728377 PMCID: PMC3984211 DOI: 10.1371/journal.pone.0094655] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Accepted: 03/18/2014] [Indexed: 11/25/2022] Open
Abstract
Background Dengue virus (DENV) NS1 antigen detection is regarded as an early diagnostic marker. Accordingly, several studies have evaluated the performance of tests that utilize NS1 capture, but the results of individual studies may be limited due to the restricted sample size of the patients recruited. Therefore, our objective was to perform a meta-analysis of the diagnostic accuracy of two commercial NS1 ELISAs (Panbio and Platelia). Methods and Results Studies of interest were found in PubMed, Embase and Google Scholar databases using defined inclusion/exclusion criteria. A total of 30 studies containing 12,105 total enrolled patients were included. The results were as follows: 1) Panbio assays showed low overall performance, sensitivity 66% (95% confidence interval (CI) 61–71), specificity 99% (95% CI 96–100), positive likelihood ratio (LR+) 98 (95% CI 20–464), negative likelihood ratio (LR-) 0.3 (95% CI 0.2–0.4), diagnostic odds ratio (DOR) 289 (95% CI 59–1412); 2) Platelia assays showed high overall performance, sensitivity 74% (95% CI 63–82), specificity 99% (95% CI 97–100), LR+ 175 (95% CI 28–1099), LR- 0.3 (95% CI 0.2–0.4), DOR 663 (95% CI 98–4478). The lowest sensitivity values were for secondary infections (57% [95% CI 47–67] and 66% [95% CI 53–77] for Panbio and Platelia, respectively) and for the detection of DENV4. Regarding clinical manifestations, the sensitivity of Platelia was 69% (95% CI 43–86) and 60% (95% CI 48–70) for fever and dengue hemorrhagic fever, respectively. In addition, the sensitivity of both tests was slightly lower for samples from Southeast Asia and Oceania. Conclusion DENV1 samples gave higher sensitivity results for both tests. We observed that factors negatively influencing the tests, such as the type of infection, geographical origins of samples and viral serotypes, require further investigation to optimize the diagnostic accuracy.
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Affiliation(s)
- Vivaldo G. da Costa
- Virology Laboratory, Federal University of Goiás, Jataí, Brazil
- * E-mail: (VGC); (MLM)
| | | | - Marcos L. Moreli
- Virology Laboratory, Federal University of Goiás, Jataí, Brazil
- * E-mail: (VGC); (MLM)
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32
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The dengue virus non-structural 1 protein: Risks and benefits. Virus Res 2014; 181:53-60. [DOI: 10.1016/j.virusres.2014.01.001] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 12/26/2013] [Accepted: 01/03/2014] [Indexed: 11/21/2022]
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33
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Fuchs I, Bin H, Schlezinger S, Schwartz E. NS1 antigen testing for the diagnosis of dengue in returned Israeli travelers. J Med Virol 2014; 86:2005-10. [DOI: 10.1002/jmv.23879] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/12/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Inbal Fuchs
- The Pediatric Infectious Disease Unit; Soroka University Medical Center; Ben-Gurion University of the Negev; Beer-Sheva Israel
| | - Hana Bin
- National Center for Zoonotic Viruses, Central Virology Laboratory; Ministry of Health, Public Health Services, Sheba Medical Center; Tel Hashomer Israel
| | - Sara Schlezinger
- National Center for Zoonotic Viruses, Central Virology Laboratory; Ministry of Health, Public Health Services, Sheba Medical Center; Tel Hashomer Israel
| | - Eli Schwartz
- Center for Geographic Medicine and Tropical Diseases, Sheba Medical Center; Tel Hashomer Israel
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Boaz M, Janosczyk H, Garg S, Yost S, Hildreth SW, Dayan G, Starr-Spires L. Virological confirmation of suspected dengue in a Phase 2 Latin American vaccine trial: Implications for vaccine efficacy evaluation. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.trivac.2014.07.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ganguly A, Malabadi RB, Loebenberg R, Suresh MR, Sunwoo HH. Heterosandwich immunoswab assay for dengue virus Ns1 antigen detection. Diagn Microbiol Infect Dis 2014; 78:35-9. [DOI: 10.1016/j.diagmicrobio.2013.10.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2013] [Revised: 09/24/2013] [Accepted: 10/06/2013] [Indexed: 10/26/2022]
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Colombo TE, Vedovello D, Araki CS, Cogo-Moreira H, dos Santos INP, Reis AFN, Costa FR, Cruz LEAA, Casagrande L, Regatieri LJ, Junior JF, Bronzoni RVDM, Schmidt DJ, Nogueira ML. Dengue-4 false negative results by Panbio® Dengue Early ELISA assay in Brazil. J Clin Virol 2013; 58:710-2. [PMID: 24238889 DOI: 10.1016/j.jcv.2013.10.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 09/28/2013] [Accepted: 10/18/2013] [Indexed: 11/26/2022]
Abstract
BACKGROUND Dengue is a serious public health problem in numerous countries. The ability to rapidly diagnosis dengue is important for patient triage and management. Detection of dengue viral protein, NS1, represents a new approach to dengue diagnosis. OBJECTIVE The present study aims to evaluate if there are false negative results using the NS1 Ag rapid assay (Panbio(®) Dengue Early ELISA) in two different epidemiological situations (epidemic and non-epidemic). STUDY DESIGN 220 serum samples from patients with clinical symptoms of classical dengue fever were tested by NS1 antigen capture ELISA and Multiplex-Nested-PCR. RESULTS In samples collected in a non-epidemic period we found a 100% agreement of ELISA and RT-PCR in dengue negative samples and 85% agreement of ELISA and RT-PCR in dengue positive samples. But when we tested samples during an epidemic period (large DENV-4 outbreak) we found 15% false negative results (p<0.05) in dengue negative samples. CONCLUSIONS Due to false negative results for DENV-4, the sole use of the Panbio(®) Dengue Early ELISA assay as a screening method for monitoring circulating dengue serotypes must be reevaluated.
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Affiliation(s)
- Tatiana Elias Colombo
- Faculdade de Medicina de São José do Rio Preto (FAMERP), São José do Rio Preto, SP, Brazil; Universidade Estadual Paulista "Júlio de Mesquitta e Filho" (IBILCE/UNESP), São José do Rio Preto, SP, Brazil
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Radzol ARM, Lee KY, Mansor W. Raman molecular fingerprint of non-structural protein 1 in phosphate buffer saline with gold substrate. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2013; 2013:1438-41. [PMID: 24109968 DOI: 10.1109/embc.2013.6609781] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
SERS is a form of Raman spectroscopy that is enhanced with nano-sensing chip as substrate. It can yield distinct biochemical fingerprint for molecule of solids, liquids and gases. Vice versa, it can be used to identify unknown molecule. It has further advantage of being non-invasive, non-contact and cheap, as compared to other existing laboratory based techniques. NS1 has been clinically accepted as an alternative biomarker to IgM in diagnosing viral diseases carried by virus of flaviviridae. Its presence in the blood serum at febrile stage of the flavivirus infection has been proven. Being an antigen, it allows early detection that can help to reduce the mortality rate. This paper proposes SERS as a technique for detection of NS1 from its scattering spectrum. Contribution from our work so far has never been reported. From our experiments, it is found that NS1 protein is Raman active. Its spectrum exhibits five prominent peaks at Raman shift of 548, 1012, 1180, 1540 and 1650 cm(-1). Of these, peak at 1012 cm(-1) scales the highest intensity. It is singled out as the peak to fingerprint the NS1 protein. This is because its presence is verified by the ring breathing vibration of the benzene ring structure side chain molecule. The characteristic peak is found to vary in proportion to concentration. It is found that for a 99% change in concentration, a 96.7% change in intensity is incurred. This yields a high sensitivity of about one a.u. per ppm. Further investigation from the characterization graph shows a correlation coefficient of 0.9978 and a standard error estimation of 0.02782, which strongly suggests a linear relationship between the concentration and characteristic peak intensity of NS1. Our finding produces favorable evidence to the use of SERS technique for detection of NS1 protein for early detection of flavivirus infected diseases with gold substrate.
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Huang CH, Kuo LL, Yang KD, Lin PS, Lu PL, Lin CC, Chang K, Chen TC, Lin WR, Lin CY, Chen YH, Wu HS. Laboratory diagnostics of dengue fever: An emphasis on the role of commercial dengue virus nonstructural protein 1 antigen rapid test. JOURNAL OF MICROBIOLOGY, IMMUNOLOGY, AND INFECTION = WEI MIAN YU GAN RAN ZA ZHI 2013; 46:358-65. [DOI: 10.1016/j.jmii.2012.07.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Revised: 06/10/2012] [Accepted: 07/17/2012] [Indexed: 11/26/2022]
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Comparison of surface plasmon resonance, resonant waveguide grating biosensing and enzyme linked immunosorbent assay (ELISA) in the evaluation of a dengue virus immunoassay. BIOSENSORS-BASEL 2013; 3:297-311. [PMID: 25586260 PMCID: PMC4263579 DOI: 10.3390/bios3030297] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 06/26/2013] [Accepted: 07/26/2013] [Indexed: 11/17/2022]
Abstract
Two label-free biosensor platforms, Resonance Waveguide Grating (RWG) and Surface Plasmon Resonance (SPR), were used to rank a large panel of anti-dengue virus NS1 antibodies. Dengue non-structural 1 (NS1) protein is an established serological marker for the early detection of dengue infection. A variety of commercial dengue NS1 antigen capture immunoassays are available in both ELISA and lateral flow format. However, there is a significant scope to improve both the sensitivity and the specificity of those tests. The interactions of antibody (Ab)-antigen (Ag) were profiled, with weak interactions (KD= 1–0.1 μM) able to be detected under static equilibrium conditions by RWG, but not observed to under more rigorous flow conditions using SPR. There were significant differences in the absolute affinities determined by the two technologies, and there was a poor correlation between antibodies best ranked by RWG and the lower limit of detection (LLOD) found by ELISA. Hence, whilst high-throughput RWG can be useful as preliminary screening for higher affinity antibodies, care should be exercised in the assignation of quantitative values for affinity between different assay formats.
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Micro-spot with integrated pillars (MSIP) for detection of dengue virus NS1. Biomed Microdevices 2013; 15:959-71. [DOI: 10.1007/s10544-013-9787-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Chappuis F, Alirol E, d’Acremont V, Bottieau E, Yansouni C. Rapid diagnostic tests for non-malarial febrile illness in the tropics. Clin Microbiol Infect 2013; 19:422-31. [DOI: 10.1111/1469-0691.12154] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Revised: 12/21/2012] [Accepted: 01/07/2013] [Indexed: 11/30/2022]
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Falconar AKI, Romero-Vivas CME. A simple, inexpensive, robust and sensitive dot-blot assay for equal detection of the nonstructural-1 glycoprotein of all dengue virus serotypes. Virol J 2013; 10:126. [PMID: 23607292 PMCID: PMC3655085 DOI: 10.1186/1743-422x-10-126] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Accepted: 04/17/2013] [Indexed: 11/12/2022] Open
Abstract
Background Detection of dengue virus (DENV) soluble/excreted (s/e) form of the nonstructural-1 (NS1) glycoprotein in patient acute-phase sera is ideal for diagnosis. The commercially-available detection assays are, however, too expensive for routine use and have low specificity, particularly for the s/e NS1 glycoprotein of DENV-2 and DENV-4, which are important causes of lethal human disease worldwide. Methods Mouse monoclonal antibodies (MAbs) were generated and screened against s/e NS1 glycoprotein purified from each DENV serotype to obtain those that reacted equally with each serotype, but not with yellow fever virus (YFV) s/e NS1 glycoprotein or human serum proteins. One MAb, MAb 2C4.6, was further tested against these DENV glycoproteins in human sera using simple, peroxidase-labelled secondary antibody/substrate-developed dot-blot assays. Results Optimal quenching of endogenous human serum peroxidases was attained using 3% H2O2 in H20 for 5 min. MAb 2C4.6 showed an acceptable detection sensitivity of < 32 ng/ml for the s/e NS1 glycoprotein of each DENV serotype but did not cross-react with the YFV s/e NS1 glycoprotein or human serum proteins. By contrast, the LX1 epitope-specific MAb, 3D1.4, showed similar detection sensitivity against only the DENV-1 NS1 glycoprotein, consistent with results from commercial DENV s/e NS1 glycoprotein detection assays. DENV s/e NS1 glycoproteins were stable in human sera after drying on the nitrocellulose membranes and storage for one month at ambient temperature (28°C) before being processed. The total assay time was reduced to 3 h without any loss of detection sensitivity. This dot-blot format was ideal for the circulating immune complex disruption step, which is required for increased DENV s/e NS1 glycoprotein detection. Conclusions This is the first study to determine the detection sensitivity of MAbs against known concentrations of s/e NS1 glycoprotein from each DENV serotype. The preparation of patient serum samples for dot-blot assays can be performed by staff with a basic level of training and storage at low temperatures (e.g., -80°C) is not necessary. These simple, inexpensive (US$ 0.05/sample), robust, sensitive and relatively rapid assays, using improved MAbs such as MAb 2C4.6, should be ideal for the diagnosis of all DENV serotypes in DENV endemic regions.
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Affiliation(s)
- Andrew K I Falconar
- Laboratorio de Enfermedades Tropicales, Departmento de Medicina, Universidad del Norte, Km 5 Antigua via Puerto Colombia, Barranquilla, Colombia.
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de la Cruz-Hernández SI, Flores-Aguilar H, González-Mateos S, López-Martinez I, Alpuche-Aranda C, Ludert JE, del Angel RM. Determination of viremia and concentration of circulating nonstructural protein 1 in patients infected with dengue virus in Mexico. Am J Trop Med Hyg 2013; 88:446-54. [PMID: 23339203 DOI: 10.4269/ajtmh.12-0023] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Higher levels of viremia and circulating nonstructural protein 1 (NS1) have been associated with dengue disease severity. In this study, viremia and circulating NS1 levels were determined in 225 serum samples collected from patients in Mexico infected with dengue virus serotypes 1 and 2 (DENV-1 and DENV-2). Patients with dengue hemorrhagic fever (DHF) who were infected with DENV-1 showed higher levels of circulating NS1 than patients with dengue fever (DF) (P = 0.0175). Moreover, NS1 levels were higher in patients with primary infections with DENV-1 than in patient infected with DENV-2 (P < 0.0001) and in patients with primary infections with DENV-2 than in patients with secondary infections with DENV-2 (P = 0.0051). Unexpectedly, viremia levels were higher in patients with DF than in those with DHF infected with either DENV-1 or DENV-2 (P = 0.0019 and P = 0.001, respectively) and in patients with primary infections than those with secondary DENV-2 infections (P < 0.0001). Results indicate that levels of circulating NS1 vary according to the infecting serotype, immunologic status (primary or secondary infection), and dengue disease severity.
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Affiliation(s)
- Sergio I de la Cruz-Hernández
- Departament of Virology, Instituto de Diagnóstico y Referencia Epimiológicos, Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional, Mexico City, Mexico.
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Athmaram TN, Saraswat S, Misra P, Shrivastava S, Singh AK, Verma SK, Gopalan N, Behara PK, Rao PVL. Optimization of Dengue-3 recombinant NS1 protein expression in E. coli and in vitro refolding for diagnostic applications. Virus Genes 2012. [PMID: 23188193 DOI: 10.1007/s11262-012-0851-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Dengue non-structural protein (NS1) is known to be protective antigen and also has immense application for serodiagnosis. Several serodiagnostic assays available for dengue viral infection are dependent on tissue culture-grown viral proteins. This task is unsafe, laborious, more expensive that makes it unsuitable for routine large-scale production. Although bacterial expression is relatively simple and easy for recombinant protein expression, it is more challenging to make NS1 protein with native structural and immunological features using bacterial expression system. We have successfully developed a method leading to the purification and refolding of recombinant dengue virus type 3 (DENV3) NS1. The gene encoding NS1 was amplified and cloned in pET28a (+) vector. In order to increase the purity of the recombinant NS1, the transgene was engineered to carry 6× Histidine tags at both N and C-terminal ends. The recombinant construct (pETNS1) was transformed into E. coli Rosetta-gami cells and the expression conditions viz IPTG concentration, media type, temperature, and harvest time were optimized. The size of the expressed protein was found to be ~45 kDa and the authenticity of the expressed protein was confirmed using anti-His and anti-NS1 monoclonal antibodies. The NS1 protein was purified under denaturing conditions, to attain the native conformation, NS1 protein was in vitro refolded and dialyzed. The refolded NS1 protein was detected by commercial Immuno chromatographic strip and NS1 specific monoclonal antibodies. IgM antibody capture ELISA was performed using refolded recombinant NS1 protein which recognized the IgM antibodies in dengue-positive samples of acute phase of infection. Our result suggests that rNS1 protein has immense diagnostic potential and can be used in developing point of care diagnostic assays.
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Affiliation(s)
- T N Athmaram
- Bio-process Scale Up Facility, Defence Research and Development Establishment, Ministry of Defence (Government of India), Gwalior, MP 474 002, India.
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Commercial dengue rapid diagnostic tests for point-of-care application: recent evaluations and future needs? J Biomed Biotechnol 2012; 2012:151967. [PMID: 22654479 PMCID: PMC3357944 DOI: 10.1155/2012/151967] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Accepted: 02/11/2012] [Indexed: 12/16/2022] Open
Abstract
Dengue fever, dengue haemorrhagic fever, and dengue shock syndrome (DF/DHF/DSS) are tropical diseases that cause significant humanitarian and economic hardship. It is estimated that more than 2.5 billion people are at risk of infection and more than 100 countries have endemic dengue virus transmission. Laboratory tests are essential to provide an accurate diagnosis of dengue virus infection so that appropriate treatment and patient management may be administered. In many dengue endemic settings, laboratory diagnostic resources are limited and simple rapid diagnostic tests (RDTs) provide opportunities for point-of-care diagnosis. This paper addresses current issues relating to the application of commercial dengue RDTs for the diagnosis of acute dengue virus infection, recent diagnostic evaluations, and identifies future needs.
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de la Cruz Hernández SI, González Mateos S, Flores Aguilar H, López Martinez I, Alpuche Aranda C, Ludert JE, Del Angel RM. Evaluation of a novel commercial rapid test for dengue diagnosis based on specific IgA detection. Diagn Microbiol Infect Dis 2012; 72:150-5. [PMID: 22248735 DOI: 10.1016/j.diagmicrobio.2011.11.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Revised: 10/31/2011] [Accepted: 11/08/2011] [Indexed: 01/31/2023]
Abstract
The performance of the novel commercial test ASSURE® Dengue IgA Rapid test (MP Diagnostics) was evaluated using a panel of 172 sera collected from dengue patients and 47 sera from healthy blood donors. The overall specificity and sensitivity were 61.0% and 85.1%, respectively. However, the positivity rate for IgA went from 33.3% for sera collected the same day of fever onset to 81.2% for sera collected 5 days after fever onset. Infections with serotype 2 viruses were detected more efficiently than those with serotype 1 viruses, and no sera from infections with serotypes 3 and 4 were available. In addition, the kit was twice more efficient at detecting secondary infections than at detecting primary infections. Finally, the ASSURE® test showed good repeatability and reproducibility. The results of this study suggest that the ASSURE® Dengue IgA Rapid test may become a useful and easy-to-use test for early dengue diagnosis.
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Affiliation(s)
- Sergio Isaac de la Cruz Hernández
- Departamento de Virología, Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico D.F., Mexico
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Bhatnagar J, Blau DM, Shieh WJ, Paddock CD, Drew C, Liu L, Jones T, Patel M, Zaki SR. Molecular detection and typing of dengue viruses from archived tissues of fatal cases by rt-PCR and sequencing: diagnostic and epidemiologic implications. Am J Trop Med Hyg 2012; 86:335-40. [PMID: 22302871 DOI: 10.4269/ajtmh.2012.11-0346] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Diagnosis of dengue virus (DENV) infection in fatal cases is challenging because of the frequent unavailability of blood or fresh tissues. For formalin-fixed, paraffin-embedded (FFPE) tissues immunohistochemistry (IHC) can be used; however, it may not be as sensitive and serotyping is not possible. The application of reverse transcription-polymerase chain reaction (RT-PCR) for the detection of DENV in FFPE tissues has been very limited. We evaluated FFPE autopsy tissues of 122 patients with suspected DENV infection by flavivirus and DENV RT-PCR, sequencing, and DENV IHC. The DENV was detected in 61 (50%) cases by RT-PCR or IHC. The RT-PCR and sequencing detected DENV in 60 (49%) cases (DENV-1 in 16, DENV-2 in 27, DENV-3 in 8, and DENV-4 in 6 cases). No serotype could be identified in three cases. The IHC detected DENV antigens in 50 (40%) cases. The RT-PCR using FFPE tissue improves detection of DENV in fatal cases and provides sequence information useful for typing and epidemiologic studies.
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Affiliation(s)
- Julu Bhatnagar
- Infectious Diseases Pathology Branch, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333, USA.
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Bisordi I, Rocco IM, Suzuki A, Katz G, Silveira VR, Maeda AY, Souza RPD, Bassi MG, Del Tedesco EF, Freitas E, Bessa TÁF. Evaluation of dengue NS1 antigen detection for diagnosis in public health laboratories, São Paulo State, 2009. Rev Inst Med Trop Sao Paulo 2011; 53:315-20. [DOI: 10.1590/s0036-46652011000600003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Accepted: 10/31/2011] [Indexed: 11/21/2022] Open
Abstract
The present work evaluated the diagnostic accuracy of detection of Dengue NS1 antigen employing two NS1 assays, an immunochromatographic assay and ELISA, in the diagnostic routine of Public Health laboratories. The results obtained with NS1 assay were compared with virus isolation and, in a subpopulation of cases, they were compared with the IgM-ELISA results obtained with convalescent samples. A total of 2,321 sera samples were analyzed by one of two NS1 techniques from March to October 2009. The samples were divided into five groups: groups I, II and III included samples tested by NS1 and virus isolation, and groups IV and V included patients with a first sample tested by NS1 and a second sample tested by IgM-ELISA. Sensitivity, specificity, positive and negative predictive values, Kappa Index and Kappa Concordance were calculated. The results showed that NS1 testing in groups I, II and III had high sensitivity (98.0%, 99.5% and 99.3%), and predictive values and Kappa index between 0.9 - 1.0. Groups IV and V only had Kappa Concordance calculated, since the samples were analyzed according to the presence of NS1 antigen or IgM antibody. Concordance of 92.1% was observed when comparing the results of NS1-negative samples with IgM-ELISA. Based on the findings, it is possible to suggest that the tests for NS1 detection may be important tools for monitoring the introduction and spread of Dengue serotypes.
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Polyclonal antibodies against properly folded Dengue virus NS1 protein expressed in E. coli enable sensitive and early dengue diagnosis. J Virol Methods 2011; 175:109-16. [PMID: 21569796 DOI: 10.1016/j.jviromet.2011.04.029] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Revised: 04/25/2011] [Accepted: 04/27/2011] [Indexed: 12/11/2022]
Abstract
The non-structural 1 (NS1) protein plays an important role in dengue diagnosis because it has been detected as a soluble serum antigen in both primary and secondary infections. The NS1 protein was expressed in Escherichia coli cells, and the efficiency of four different refolding protocols was tested. All of the protocols generated dimeric NS1 in a conformation similar to that of the protein expressed by eukaryotic cells. A polyclonal antibody produced from the properly folded E. coli recombinant NS1 (rNS1) protein proved to be a useful tool for the diagnosis of Dengue virus because it detected 100% of the Dengue virus 2 (DENV2) in infected patients' sera and 60% of the DENV IgM-positive sera not detected by commercial NS1-based diagnostic kits. These data suggest a high-efficiency method for correctly folding rNS1 that maintains its structural and immunogenic properties. In addition, a detection method using the polyclonal antibody against correctly folded rNS1 seemed to be more sensitive and efficient for NS1 detection in serum, highlighting its usefulness for developing a high-sensitivity diagnostic kit.
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Comparison of two generations of the Panbio dengue NS1 capture enzyme-linked immunosorbent assay. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2011; 18:1031-3. [PMID: 21525305 DOI: 10.1128/cvi.00024-11] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We compared two generations of Panbio (Brisbane, Australia) commercial kits for NS1 antigen capture for early diagnosis of dengue: the first-generation pan-E Dengue Early ELISA and the second-generation Dengue Early ELISA. The test improvement resulted in a highly sensitive and specific test suitable for use as a first-line test in the field.
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