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Alternative Methods to Current In Vivo Procedures to Address the 3Rs Tenet in Rabies Proficiency Testing. Viruses 2022; 14:v14081698. [PMID: 36016320 PMCID: PMC9414609 DOI: 10.3390/v14081698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 07/26/2022] [Accepted: 07/29/2022] [Indexed: 11/23/2022] Open
Abstract
Canine rabies is responsible for an estimated 59,000 human deaths every year. In an attempt to reach the ZeroBy30 goal, robust disease surveillance coupled with improved diagnostics play a paramount role in ensuring reliable data and gradually attesting rabies control advancements. In this context, proficiency testing is organized to harmonize rabies diagnostic capacities. In most exercises, rabies-positive samples consist of brains collected from intracerebrally inoculated mice. This procedure causes distress and severe suffering to animals, raising important ethical concerns that can no longer be ignored. In the last decades, the 3Rs tenet (Replace, Reduce, Refine) has been successfully implemented in several scientific areas, and we strongly support its application in the framework of rabies proficiency testing. Here, we discuss cell-based technologies as innovative sustainable in vitro candidate systems to replace in vivo experiments for the production of proficiency testing samples. The application of these alternative methods can allow completely in vitro or ex vivo production of rabies proficiency testing panels, which would represent an important replacement or reduction/refinement for current in vivo procedures.
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Dedkov V, Deviatkin A, Poleshchuk Е, Safonova M, Blinova E, Shchelkanov MY, Sidorov G, Simonova E, Shipulin G. Development and evaluation of a RT-qPCR assay for fast and sensitive rabies diagnosis. Diagn Microbiol Infect Dis 2018; 90:18-25. [DOI: 10.1016/j.diagmicrobio.2017.09.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 09/13/2017] [Accepted: 09/14/2017] [Indexed: 12/17/2022]
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Clavijo A, Freire de Carvalho MH, Orciari LA, Velasco-Villa A, Ellison JA, Greenberg L, Yager PA, Green DB, Vigilato MA, Cosivi O, Del Rio-Vilas VJ. An inter- laboratory proficiency testing exercise for rabies diagnosis in Latin America and the Caribbean. PLoS Negl Trop Dis 2017; 11:e0005427. [PMID: 28369139 PMCID: PMC5391118 DOI: 10.1371/journal.pntd.0005427] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 04/13/2017] [Accepted: 02/21/2017] [Indexed: 12/02/2022] Open
Abstract
The direct fluorescent antibody test (DFA), is performed in all rabies reference laboratories across Latin America and the Caribbean (LAC). Despite DFA being a critical capacity in the control of rabies, there is not a standardized protocol in the region. We describe the results of the first inter-laboratory proficiency exercise of national rabies laboratories in LAC countries as part of the regional efforts towards dog-maintained rabies elimination in the American region. Twenty three laboratories affiliated to the Ministries of Health and Ministries of Agriculture participated in this exercise. In addition, the laboratories completed an online questionnaire to assess laboratory practices. Answers to the online questionnaire indicated large variability in the laboratories throughput, equipment used, protocols availability, quality control standards and biosafety requirements. Our results will inform actions to improve and harmonize laboratory rabies capacities across LAC in support for the regional efforts towards elimination of dog-maintained rabies.
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Affiliation(s)
- Alfonso Clavijo
- Pan American Foot-and-Mouth Disease Center, Pan American Health Organization, Rio de Janeiro, Brazil
| | | | - Lillian A. Orciari
- National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Andres Velasco-Villa
- National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - James A. Ellison
- National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Lauren Greenberg
- National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Pamela A. Yager
- National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Douglas B. Green
- National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Marco A. Vigilato
- Pan American Foot-and-Mouth Disease Center, Pan American Health Organization, Rio de Janeiro, Brazil
| | - Ottorino Cosivi
- Pan American Foot-and-Mouth Disease Center, Pan American Health Organization, Rio de Janeiro, Brazil
| | - Victor J. Del Rio-Vilas
- Pan American Foot-and-Mouth Disease Center, Pan American Health Organization, Rio de Janeiro, Brazil
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Wadhwa A, Wilkins K, Gao J, Condori Condori RE, Gigante CM, Zhao H, Ma X, Ellison JA, Greenberg L, Velasco-Villa A, Orciari L, Li Y. A Pan-Lyssavirus Taqman Real-Time RT-PCR Assay for the Detection of Highly Variable Rabies virus and Other Lyssaviruses. PLoS Negl Trop Dis 2017; 11:e0005258. [PMID: 28081126 PMCID: PMC5230753 DOI: 10.1371/journal.pntd.0005258] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Accepted: 12/14/2016] [Indexed: 11/19/2022] Open
Abstract
Rabies, resulting from infection by Rabies virus (RABV) and related lyssaviruses, is one of the most deadly zoonotic diseases and is responsible for up to 70,000 estimated human deaths worldwide each year. Rapid and accurate laboratory diagnosis of rabies is essential for timely administration of post-exposure prophylaxis in humans and control of the disease in animals. Currently, only the direct fluorescent antibody (DFA) test is recommended for routine rabies diagnosis. Reverse-transcription polymerase chain reaction (RT-PCR) based diagnostic methods have been widely adapted for the diagnosis of other viral pathogens, but there is currently no widely accepted rapid real-time RT-PCR assay for the detection of all lyssaviruses. In this study, we demonstrate the validation of a newly developed multiplex real-time RT-PCR assay named LN34, which uses a combination of degenerate primers and probes along with probe modifications to achieve superior coverage of the Lyssavirus genus while maintaining sensitivity and specificity. The primers and probes of the LN34 assay target the highly conserved non-coding leader region and part of the nucleoprotein (N) coding sequence of the Lyssavirus genome to maintain assay robustness. The probes were further modified by locked nucleotides to increase their melting temperature to meet the requirements for an optimal real-time RT-PCR assay. The LN34 assay was able to detect all RABV variants and other lyssaviruses in a validation panel that included representative RABV isolates from most regions of the world as well as representatives of 13 additional Lyssavirus species. The LN34 assay was successfully used for both ante-mortem and post-mortem diagnosis of over 200 clinical samples as well as field derived surveillance samples. This assay represents a major improvement over previously published rabies specific RT-PCR and real-time RT-PCR assays because of its ability to universally detect RABV and other lyssaviruses, its high throughput capability and its simplicity of use, which can be quickly adapted in a laboratory to enhance the capacity of rabies molecular diagnostics. The LN34 assay provides an alternative approach for rabies diagnostics, especially in rural areas and rabies endemic regions that lack the conditions and broad experience required to run the standard DFA assay. Rabies is a preventable disease–but is still responsible for approximately 70,000 human deaths worldwide each year. The majority of human deaths occur in Asia and Africa where there is a lack of diagnostic resources and expertise, making it difficult to develop effective prevention and control strategies. In recent years, several real-time RT-PCR based diagnostic assays have been introduced to many developing countries in an effort to control the H1N1 pandemic flu, Ebola outbreak, and other tropical viral infections. In an effort to further improve rabies diagnostics, we developed a pan-lyssavirus Taqman real-time RT-PCR assay called LN34 for the detection of all known RABV variants and other lyssavirus species. The LN34 assay uses a combination of degenerate nucleotides, multiplex primers and probes, and unique probe modifications to achieve superior sensitivity and specificity compared to previously published RT-PCR based rabies diagnostics. Equally important, the LN34 assay is simple to set up, high throughput, combines multiple standard controls and can be used directly in widely available real-time RT-PCR systems. The LN34 assay was validated using a broad and comprehensive panel of highly diverse RABV variants and other lyssaviruses. A validated universal rabies diagnostic assay will be important in regions where RABV and other lyssaviruses co-circulate and for establishing a widely accepted diagnostic protocol. Over 200 clinical samples (including ante-mortem, post-mortem, and field derived samples) were tested with the LN34 assay, and the assay achieved 100% diagnostic sensitivity and specificity in our laboratory. Over 300 published genome sequences from representatives of RABV and other lyssaviruses were found to contain the conserved LN34 primer and probe targeting sites in an in silico analysis. We are expanding the validation of the LN34 assay to multiple domestic and international laboratories and expect the LN34 assay will drastically improve rabies diagnostic capacities globally.
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Affiliation(s)
- Ashutosh Wadhwa
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - Kimberly Wilkins
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - Jinxin Gao
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - Rene Edgar Condori Condori
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - Crystal M. Gigante
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - Hui Zhao
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - Xiaoyue Ma
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - James A. Ellison
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - Lauren Greenberg
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - Andres Velasco-Villa
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - Lillian Orciari
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - Yu Li
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
- * E-mail:
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Schulz C, van der Poel WHM, Ponsart C, Cay AB, Steinbach F, Zientara S, Beer M, Hoffmann B. European interlaboratory comparison of Schmallenberg virus (SBV) real-time RT-PCR detection in experimental and field samples: The method of extraction is critical for SBV RNA detection in semen. J Vet Diagn Invest 2015; 27:422-30. [PMID: 26185122 DOI: 10.1177/1040638715593798] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Molecular methods for the detection of Schmallenberg virus (SBV) RNA were rapidly developed after the emergence of this novel orthobunyavirus in Europe. The SBV epizootic wave has declined, but infectious SBV in SBV RNA-positive semen remains a possible risk for the distribution of SBV. However, the abilities of SBV molecular detection methods used at European laboratories have not yet been assessed, to our knowledge. The performances of extraction and real-time reverse transcription polymerase chain reaction (RT-qPCR) methods used at 27 German and 17 other European laboratories for SBV RNA detection in the matrices of whole blood, serum, tissue homogenate, RNA eluates, and bovine semen were evaluated in 2 interlaboratory trials with special emphasis on semen extraction methods. For reliable detection of viral genome in bovine semen samples, highly effective extraction methods are essential to cope with the potential inhibitory effects of semen components on PCR results. All methods used by the 44 laboratories were sufficiently robust to detect SBV RNA with high diagnostic sensitivity (100%) and specificity (95.8%) in all matrices, except semen. The trials demonstrated that the published recommended semen extraction methods (Hoffmann et al. 2013) and a combination of TRIzol LS with an alternative extraction kit have a considerably higher diagnostic sensitivity to detect SBV RNA in semen up to a detection limit of Cq ≤35 compared to other extraction methods used. A thorough validation of extraction methods with standardized semen batches is essential before their use for SBV RNA detection in bovine semen.
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Affiliation(s)
- Claudia Schulz
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany (Schulz, Beer, Hoffmann)Central Veterinary Institute of Wageningen University and Research Centre, Department of Virology, Lelystad, The Netherlands (Van der Poel)Virology Unit, French Agency for Food, Environmental and Occupational Health and Safety, Maisons-Alfort, France (Ponsart, Zientara)Enzootic and (re)emerging Diseases Unit, Veterinary and Agrochemical Research Centre, Brussel, Belgium (Cay)Virology Department, Animal Health and Veterinary Laboratories Agency-Weybridge, New Haw, Addlestone, United Kingdom (Steinbach)
| | - Wim H M van der Poel
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany (Schulz, Beer, Hoffmann)Central Veterinary Institute of Wageningen University and Research Centre, Department of Virology, Lelystad, The Netherlands (Van der Poel)Virology Unit, French Agency for Food, Environmental and Occupational Health and Safety, Maisons-Alfort, France (Ponsart, Zientara)Enzootic and (re)emerging Diseases Unit, Veterinary and Agrochemical Research Centre, Brussel, Belgium (Cay)Virology Department, Animal Health and Veterinary Laboratories Agency-Weybridge, New Haw, Addlestone, United Kingdom (Steinbach)
| | - Claire Ponsart
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany (Schulz, Beer, Hoffmann)Central Veterinary Institute of Wageningen University and Research Centre, Department of Virology, Lelystad, The Netherlands (Van der Poel)Virology Unit, French Agency for Food, Environmental and Occupational Health and Safety, Maisons-Alfort, France (Ponsart, Zientara)Enzootic and (re)emerging Diseases Unit, Veterinary and Agrochemical Research Centre, Brussel, Belgium (Cay)Virology Department, Animal Health and Veterinary Laboratories Agency-Weybridge, New Haw, Addlestone, United Kingdom (Steinbach)
| | - Ann Brigitte Cay
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany (Schulz, Beer, Hoffmann)Central Veterinary Institute of Wageningen University and Research Centre, Department of Virology, Lelystad, The Netherlands (Van der Poel)Virology Unit, French Agency for Food, Environmental and Occupational Health and Safety, Maisons-Alfort, France (Ponsart, Zientara)Enzootic and (re)emerging Diseases Unit, Veterinary and Agrochemical Research Centre, Brussel, Belgium (Cay)Virology Department, Animal Health and Veterinary Laboratories Agency-Weybridge, New Haw, Addlestone, United Kingdom (Steinbach)
| | - Falko Steinbach
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany (Schulz, Beer, Hoffmann)Central Veterinary Institute of Wageningen University and Research Centre, Department of Virology, Lelystad, The Netherlands (Van der Poel)Virology Unit, French Agency for Food, Environmental and Occupational Health and Safety, Maisons-Alfort, France (Ponsart, Zientara)Enzootic and (re)emerging Diseases Unit, Veterinary and Agrochemical Research Centre, Brussel, Belgium (Cay)Virology Department, Animal Health and Veterinary Laboratories Agency-Weybridge, New Haw, Addlestone, United Kingdom (Steinbach)
| | - Stéphan Zientara
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany (Schulz, Beer, Hoffmann)Central Veterinary Institute of Wageningen University and Research Centre, Department of Virology, Lelystad, The Netherlands (Van der Poel)Virology Unit, French Agency for Food, Environmental and Occupational Health and Safety, Maisons-Alfort, France (Ponsart, Zientara)Enzootic and (re)emerging Diseases Unit, Veterinary and Agrochemical Research Centre, Brussel, Belgium (Cay)Virology Department, Animal Health and Veterinary Laboratories Agency-Weybridge, New Haw, Addlestone, United Kingdom (Steinbach)
| | - Martin Beer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany (Schulz, Beer, Hoffmann)Central Veterinary Institute of Wageningen University and Research Centre, Department of Virology, Lelystad, The Netherlands (Van der Poel)Virology Unit, French Agency for Food, Environmental and Occupational Health and Safety, Maisons-Alfort, France (Ponsart, Zientara)Enzootic and (re)emerging Diseases Unit, Veterinary and Agrochemical Research Centre, Brussel, Belgium (Cay)Virology Department, Animal Health and Veterinary Laboratories Agency-Weybridge, New Haw, Addlestone, United Kingdom (Steinbach)
| | - Bernd Hoffmann
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany (Schulz, Beer, Hoffmann)Central Veterinary Institute of Wageningen University and Research Centre, Department of Virology, Lelystad, The Netherlands (Van der Poel)Virology Unit, French Agency for Food, Environmental and Occupational Health and Safety, Maisons-Alfort, France (Ponsart, Zientara)Enzootic and (re)emerging Diseases Unit, Veterinary and Agrochemical Research Centre, Brussel, Belgium (Cay)Virology Department, Animal Health and Veterinary Laboratories Agency-Weybridge, New Haw, Addlestone, United Kingdom (Steinbach)
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Comparison of Automated Quantitative Reverse Transcription-PCR and Direct Fluorescent-Antibody Detection for Routine Rabies Diagnosis in the United States. J Clin Microbiol 2015; 53:2983-9. [PMID: 26179300 DOI: 10.1128/jcm.01227-15] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 07/09/2015] [Indexed: 11/20/2022] Open
Abstract
Rabies virus found worldwide and prevalent throughout the United States continues to be a public health concern. Direct-fluorescent antibody (DFA) detection remains the gold standard for rabies virus diagnostics. Assessing the utility of a high-throughput molecular platform such as the QIAsymphony SP/AS, in conjunction with quantitative reverse transcription-PCR (qRT-PCR), to augment or potentially replace the DFA test, was the focus of this project. Here we describe a triplex qRT-PCR assay, including assembly and evaluation for sensitivity, specificity, and ability to detect variants. Additionally, we compared the qRT-PCR assay to the gold standard direct fluorescent-antibody test. More than 1,000 specimens submitted for routine rabies diagnosis were tested to directly compare the two methods. All results were in agreement between the two methods, with one additional specimen detected by qRT-PCR below the limits of the DFA sensitivity. With the proper continued validation for variant detection, molecular methods have a place in routine rabies diagnostics within the United States.
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7
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Deubelbeiss A, Zahno ML, Zanoni M, Bruegger D, Zanoni R. Real-Time RT-PCR for the Detection of Lyssavirus Species. J Vet Med 2014; 2014:476091. [PMID: 26464934 PMCID: PMC4590848 DOI: 10.1155/2014/476091] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 09/19/2014] [Accepted: 09/24/2014] [Indexed: 11/17/2022] Open
Abstract
The causative agents of rabies are single-stranded, negative-sense RNA viruses in the genus Lyssavirus of Rhabdoviridae, consisting of twelve classified and three as yet unclassified species including classical rabies virus (RABV). Highly neurotropic RABV causes rapidly progressive encephalomyelitis with nearly invariable fatal outcome. Rapid and reliable diagnosis of rabies is highly relevant for public and veterinary health. Due to growing variety of the genus Lyssavirus observed, the development of suitable molecular assays for diagnosis and differentiation is challenging. This work focused on the establishment of a suitable real-time RT-PCR technique for rabies diagnosis as a complement to fluorescent antibody test and rabies tissue culture infection test as gold standard for diagnosis and confirmation. The real-time RT-PCR was adapted with the goal to detect the whole spectrum of lyssavirus species, for nine of which synthesized DNA fragments were used. For the detection of species, seven probes were developed. Serial dilutions of the rabies virus strain CVS-11 showed a 100-fold higher sensitivity of real-time PCR compared to heminested RT-PCR. Using a panel of thirty-one lyssaviruses representing four species, the suitability of the protocol could be shown. Phylogenetic analysis of the sequences obtained by heminested PCR allowed correct classification of all viruses used.
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Affiliation(s)
- A. Deubelbeiss
- Institute of Virology and Immunology, 3012 Berne, Switzerland
| | - M.-L. Zahno
- Institute of Virology and Immunology, 3012 Berne, Switzerland
| | - M. Zanoni
- Institute of Virology and Immunology, 3012 Berne, Switzerland
| | - D. Bruegger
- Institute of Virology and Immunology, 3012 Berne, Switzerland
| | - R. Zanoni
- Institute of Virology and Immunology, 3012 Berne, Switzerland
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8
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Suin V, Nazé F, Francart A, Lamoral S, De Craeye S, Kalai M, Van Gucht S. A two-step lyssavirus real-time polymerase chain reaction using degenerate primers with superior sensitivity to the fluorescent antigen test. BIOMED RESEARCH INTERNATIONAL 2014; 2014:256175. [PMID: 24822188 PMCID: PMC4009295 DOI: 10.1155/2014/256175] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2013] [Revised: 03/15/2014] [Accepted: 03/15/2014] [Indexed: 12/25/2022]
Abstract
A generic two-step lyssavirus real-time reverse transcriptase polymerase chain reaction (qRT-PCR), based on a nested PCR strategy, was validated for the detection of different lyssavirus species. Primers with 17 to 30% of degenerate bases were used in both consecutive steps. The assay could accurately detect RABV, LBV, MOKV, DUVV, EBLV-1, EBLV-2, and ABLV. In silico sequence alignment showed a functional match with the remaining lyssavirus species. The diagnostic specificity was 100% and the sensitivity proved to be superior to that of the fluorescent antigen test. The limit of detection was ≤ 1 50% tissue culture infectious dose. The related vesicular stomatitis virus was not recognized, confirming the selectivity for lyssaviruses. The assay was applied to follow the evolution of rabies virus infection in the brain of mice from 0 to 10 days after intranasal inoculation. The obtained RNA curve corresponded well with the curves obtained by a one-step monospecific RABV-qRT-PCR, the fluorescent antigen test, and virus titration. Despite the presence of degenerate bases, the assay proved to be highly sensitive, specific, and reproducible.
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Affiliation(s)
- Vanessa Suin
- National Reference Centre of Rabies, Viral Diseases, Communicable and Infectious Diseases, Scientific Institute of Public Health (WIV-ISP), Engeland Street 642, 1180 Brussels, Belgium
| | - Florence Nazé
- National Reference Centre of Rabies, Viral Diseases, Communicable and Infectious Diseases, Scientific Institute of Public Health (WIV-ISP), Engeland Street 642, 1180 Brussels, Belgium
| | - Aurélie Francart
- National Reference Centre of Rabies, Viral Diseases, Communicable and Infectious Diseases, Scientific Institute of Public Health (WIV-ISP), Engeland Street 642, 1180 Brussels, Belgium
| | - Sophie Lamoral
- National Reference Centre of Rabies, Viral Diseases, Communicable and Infectious Diseases, Scientific Institute of Public Health (WIV-ISP), Engeland Street 642, 1180 Brussels, Belgium
| | - Stéphane De Craeye
- Toxoplasma Laboratory, Food-borne Pathogens, Communicable and Infectious Diseases, Scientific Institute of Public Health (WIV-ISP), Engeland Street 642, 1180 Brussels, Belgium
| | - Michael Kalai
- National Reference Centre of Rabies, Viral Diseases, Communicable and Infectious Diseases, Scientific Institute of Public Health (WIV-ISP), Engeland Street 642, 1180 Brussels, Belgium
| | - Steven Van Gucht
- National Reference Centre of Rabies, Viral Diseases, Communicable and Infectious Diseases, Scientific Institute of Public Health (WIV-ISP), Engeland Street 642, 1180 Brussels, Belgium
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9
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Fischer M, Freuling CM, Müller T, Wegelt A, Kooi EA, Rasmussen TB, Voller K, Marston DA, Fooks AR, Beer M, Hoffmann B. Molecular double-check strategy for the identification and characterization of European Lyssaviruses. J Virol Methods 2014; 203:23-32. [PMID: 24681051 DOI: 10.1016/j.jviromet.2014.03.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 03/14/2014] [Accepted: 03/18/2014] [Indexed: 10/25/2022]
Abstract
The "gold standard" for post-mortem rabies diagnosis is the direct fluorescent antibody test (FAT). However, in the case of ante-mortem non-neural sample material or decomposed tissues, the FAT reaches its limit, and the use of molecular techniques can be advantageous. In this study, we developed and validated a reverse transcription PCR cascade protocol feasible for the classification of samples, even those for which there is no epidemiological background knowledge. This study emphasises on the most relevant European lyssaviruses. In a first step, two independent N- and L-gene based pan-lyssavirus intercalating dye assays are performed in a double-check application to increase the method's diagnostic safety. For the second step, characterization of the lyssavirus positive samples via two independent multiplex PCR-systems was performed. Both assays were probe-based, species-specific multiplex PCR-systems for Rabies virus, European bat lyssavirus type 1 and 2 as well as Bokeloh bat lyssavirus. All assays were validated successfully with a comprehensive panel of lyssavirus positive samples, as well as negative material from various host species. This double-check strategy allows for both safe and sensitive screening, detection and characterization of all lyssavirus species of humans and animals, as well as the rapid identification of currently unknown lyssaviruses in bats in Europe.
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Affiliation(s)
- Melina Fischer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, D-17493 Greifswald-Insel Riems, Germany
| | - Conrad M Freuling
- Institute of Molecular Biology, Friedrich-Loeffler-Institut, Südufer 10, D-17493 Greifswald-Insel Riems, Germany
| | - Thomas Müller
- Institute of Molecular Biology, Friedrich-Loeffler-Institut, Südufer 10, D-17493 Greifswald-Insel Riems, Germany
| | - Anne Wegelt
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, D-17493 Greifswald-Insel Riems, Germany
| | - Engbert A Kooi
- Central Veterinary Institute of Wageningen UR, Houtribweg 39, NL-8221 RA Lelystad, The Netherlands
| | - Thomas B Rasmussen
- DTU National Veterinary Institute, Technical University of Denmark, Lindholm, DK-4771 Kalvehave, Denmark
| | - Katja Voller
- Animal Health & Veterinary Laboratories Agency (AHVLA, Weybridge), New Haw, Addlestone, Surrey KT15 3NB, United Kingdom
| | - Denise A Marston
- Animal Health & Veterinary Laboratories Agency (AHVLA, Weybridge), New Haw, Addlestone, Surrey KT15 3NB, United Kingdom
| | - Anthony R Fooks
- Animal Health & Veterinary Laboratories Agency (AHVLA, Weybridge), New Haw, Addlestone, Surrey KT15 3NB, United Kingdom; Department of Clinical Infection, Microbiology and Immunology, Institute of Infection and Global Health, University of Liverpool, Liverpool, Merseyside L69 7BE, United Kingdom
| | - Martin Beer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, D-17493 Greifswald-Insel Riems, Germany
| | - Bernd Hoffmann
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, D-17493 Greifswald-Insel Riems, Germany.
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