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Suchomel M, Kampf G, Gebel J, Droop F, Christiansen B, Roesch KM. How reliable are test results from 17 laboratories on the basis of EN 1500 for a hand rub based on 80% (w/w)? J Hosp Infect 2024; 147:188-196. [PMID: 38373530 DOI: 10.1016/j.jhin.2024.01.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 01/13/2024] [Accepted: 01/28/2024] [Indexed: 02/21/2024]
Abstract
INTRODUCTION A ring trial organized by the Association of Applied Hygiene (VAH) on the bactericidal efficacy of an ethanol-based hand rub was carried out in 17 laboratories according to EN 1500 with the aim of describing the variability of test results and fulfilment of the methodological acceptance criteria. METHOD As a test product, a hand rub based on 80% ethanol (w/w) was tested in comparison with the reference alcohol (60% iso-propanol, v/v) in a crossover design. After pre-washing and contamination following the norm, hands were treated either with the reference alcohol (2 × 3 mL for 2 × 30 s) or the test product (3 mL in 30 s). Post-decontamination values were determined immediately after the rub-in period. Validated neutralizers were used. The arithmetic means of all individual log10 pre-values, post-values and reduction values were calculated per laboratory. Non-inferiority was assumed when the Hodges-Lehmann 97.5% confidence limit was <0.6 in comparison with the reference. A z-score was calculated to determine the laboratory performance. RESULTS Two laboratories did not meet the acceptance criteria and were excluded from the analysis. The bactericidal efficacy of the test product was non-inferior to the reference product in four laboratories and not non-inferior in 11 laboratories. The z-score for the Hodges-Lehmann 97.5% confidence limit indicated a satisfactory performance in all laboratories. CONCLUSION We consider the EN 1500 test method to be robust in terms of the variability of test results. For products of borderline efficacy, the evaluation should be based on more than one test.
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Affiliation(s)
- M Suchomel
- Institute for Hygiene and Applied Immunology, Medical University of Vienna, Vienna, Austria.
| | - G Kampf
- University Medicine Greifswald, Greifswald, Germany
| | - J Gebel
- Institute for Hygiene and Public Health, University Hospital Bonn, Bonn, Germany
| | - F Droop
- Institute for Hygiene and Public Health, University Hospital Bonn, Bonn, Germany
| | - B Christiansen
- Association for Applied Hygiene, c/o Institute for Hygiene and Public Health, University Hospital Bonn, Bonn, Germany
| | - K-M Roesch
- Institute for Hygiene and Public Health, University Hospital Bonn, Bonn, Germany
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Møller P, Azqueta A, Sanz-Serrano J, Bakuradze T, Richling E, Eyluel Bankoglu E, Stopper H, Claudino Bastos V, Langie SAS, Jensen A, Scavone F, Giovannelli L, Wojewódzka M, Kruszewski M, Valdiglesias V, Laffon B, Costa C, Costa S, Teixeira JP, Marino M, Del Bo C, Riso P, Zheng C, Shaposhnikov S, Collins A. Visual comet scoring revisited: a guide to scoring comet assay slides and obtaining reliable results. Mutagenesis 2023; 38:253-263. [PMID: 37233347 DOI: 10.1093/mutage/gead015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 05/23/2023] [Indexed: 05/27/2023] Open
Abstract
Measurement of DNA migration in the comet assay can be done by image analysis or visual scoring. The latter accounts for 20%-25% of the published comet assay results. Here we assess the intra- and inter-investigator variability in visual scoring of comets. We include three training sets of comet images, which can be used as reference for researchers who wish to use visual scoring of comets. Investigators in 11 different laboratories scored the comet images using a five-class scoring system. There is inter-investigator variation in the three training sets of comets (i.e. coefficient of variation (CV) = 9.7%, 19.8%, and 15.2% in training sets I-III, respectively). However, there is also a positive correlation of inter-investigator scoring in the three training sets (r = 0.60). Overall, 36% of the variation is attributed to inter-investigator variation and 64% stems from intra-investigator variation in scoring between comets (i.e. the comets in training sets I-III look slightly different and this gives rise to heterogeneity in scoring). Intra-investigator variation in scoring was also assessed by repeated analysis of the training sets by the same investigator. There was larger variation when the training sets were scored over a period of six months (CV = 5.9%-9.6%) as compared to 1 week (CV = 1.3%-6.1%). A subsequent study revealed a high inter-investigator variation when premade slides, prepared in a central laboratory, were stained and scored by investigators in different laboratories (CV = 105% and 18%-20% in premade slides with comets from unexposed and hydrogen peroxide-exposed cells, respectively). The results indicate that further standardization of visual scoring is desirable. Nevertheless, the analysis demonstrates that visual scoring is a reliable way of analysing DNA migration in comets.
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Affiliation(s)
- Peter Møller
- Department of Public Health, Section of Environmental Health, University of Copenhagen, Øster Farimagsgade 5A, DK-1014 Copenhagen K, Denmark
| | - Amaya Azqueta
- Department of Pharmacology and Toxicology, School of Pharmacy and Nutrition. University of Navarra, C/Irunlarrea 1, 31009 Pamplona, Spain
| | - Julen Sanz-Serrano
- Department of Pharmacology and Toxicology, School of Pharmacy and Nutrition. University of Navarra, C/Irunlarrea 1, 31009 Pamplona, Spain
| | - Tamara Bakuradze
- Food Chemistry and Toxicology, Department of Chemistry, RPTU Kaiserslautern-Landau, Erwin-Schroedinger-Str. 52, D-67663 Kaiserslautern, Germany
| | - Elke Richling
- Food Chemistry and Toxicology, Department of Chemistry, RPTU Kaiserslautern-Landau, Erwin-Schroedinger-Str. 52, D-67663 Kaiserslautern, Germany
| | - Ezgi Eyluel Bankoglu
- Institute of Pharmacology and Toxicology, University of Würzburg, Versbacher Str. 9, 97078 Wuerzburg, Germany
| | - Helga Stopper
- Institute of Pharmacology and Toxicology, University of Würzburg, Versbacher Str. 9, 97078 Wuerzburg, Germany
| | - Victoria Claudino Bastos
- Department of Pharmacology & Toxicology, School for Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, The Netherlands
| | - Sabine A S Langie
- Department of Pharmacology & Toxicology, School for Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, The Netherlands
| | - Annie Jensen
- Department of Public Health, Section of Environmental Health, University of Copenhagen, Øster Farimagsgade 5A, DK-1014 Copenhagen K, Denmark
| | - Francesca Scavone
- Department of Neuroscience, Psychology, Pharmacology and Child Health (NEUROFARBA), Section Pharmacology and Toxicology, University of Florence, Florence, Italy
| | - Lisa Giovannelli
- Department of Neuroscience, Psychology, Pharmacology and Child Health (NEUROFARBA), Section Pharmacology and Toxicology, University of Florence, Florence, Italy
| | - Maria Wojewódzka
- Centre for Radiobiology and Biological Dosimetry, Institute of Nuclear Chemistry and Technology, Dorodna 16, 01-310 Warsaw, Poland
| | - Marcin Kruszewski
- Centre for Radiobiology and Biological Dosimetry, Institute of Nuclear Chemistry and Technology, Dorodna 16, 01-310 Warsaw, Poland
- Department of Molecular Biology and Translational Research, Institute of Rural Health, Jaczewskiego 2, 20-090 Lublin, Poland
| | - Vanessa Valdiglesias
- Universidade da Coruña, Grupo NanoToxGen, Centro Interdisciplinar de Química e Bioloxía - CICA, Departamento de Biología, A Coruña, Spain
- Instituto de Investigación Biomédica de A Coruña (INIBIC), A Coruña, Spain
| | - Blanca Laffon
- Instituto de Investigación Biomédica de A Coruña (INIBIC), A Coruña, Spain
- Universidade da Coruña, Grupo DICOMOSA, Centro Interdisciplinar de Química e Bioloxía - CICA, Departamento de Psicología, A Coruña, Spain
| | - Carla Costa
- Environmental Health Department, National Institute of Health, Porto, Portugal
- EPIUnit - Instituto de Saúde Pública, Universidade do Porto, Porto, Portugal
- Laboratory for Integrative and Translational Research in Population Health (ITR), Porto, Portugal
| | - Solange Costa
- Environmental Health Department, National Institute of Health, Porto, Portugal
- EPIUnit - Instituto de Saúde Pública, Universidade do Porto, Porto, Portugal
- Laboratory for Integrative and Translational Research in Population Health (ITR), Porto, Portugal
| | - João Paulo Teixeira
- Environmental Health Department, National Institute of Health, Porto, Portugal
- EPIUnit - Instituto de Saúde Pública, Universidade do Porto, Porto, Portugal
- Laboratory for Integrative and Translational Research in Population Health (ITR), Porto, Portugal
| | - Mirko Marino
- Department of Food, Environmental and Nutritional Sciences (DeFENS), Università degli Studi di Milano, 20133 Milan, Italy
| | - Cristian Del Bo
- Department of Food, Environmental and Nutritional Sciences (DeFENS), Università degli Studi di Milano, 20133 Milan, Italy
| | - Patrizia Riso
- Department of Food, Environmental and Nutritional Sciences (DeFENS), Università degli Studi di Milano, 20133 Milan, Italy
| | - Congying Zheng
- Department of Pharmacology & Toxicology, School for Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, The Netherlands
- NorGenotech AS, Oslo, Norway
| | | | - Andrew Collins
- NorGenotech AS, Oslo, Norway
- Department of Nutrition, University of Oslo, Oslo, Norway
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Kluxen FM, Totti S, Maas W, Toner F, Page L, Webbley K, Nagane R, Mingoia R, Whitfield C, Kendrick J, Valentine C, Dorange JB, Egron C, Imart C, Domoradzki JY, Fisher P, Lorez C, McEuen S, Felkers E, Chen T, Wiemann C. An OECD TG 428 study ring trial with 14C-Caffeine demonstrating repeatability and robustness of the dermal absorption in vitro method. Regul Toxicol Pharmacol 2022; 132:105184. [PMID: 35577015 DOI: 10.1016/j.yrtph.2022.105184] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/19/2022] [Accepted: 05/01/2022] [Indexed: 10/18/2022]
Abstract
The dermal absorption potential of 14C-Caffeine applied as a 4 mg/mL concentration (10 μL/cm2 finite dose) was investigated in six laboratories under Good Laboratory Practice conditions using an OECD TG 428-compliant in vitro assay with flow-through cells and split-thickness human skin. Potential sources of variation were reduced by a standardized protocol, test item and skin source. Particularly, skin samples from same donors were distributed over two repeats and between labs in a non-random, stratified design. Very similar recovery was achieved in the various assay compartments between laboratories, repeats and donors, demonstrating that the assay can be robustly and reliably performed. The absorption in one laboratory was 5-fold higher than in the others. This did not clearly correlate with skin integrity parameters but might be associated with an accidental COVID-19 pandemic-related interruption in sample shipment. It is possible that other factors may affect dermal absorption variation not routinely assessed or considered in the current method. The mean receptor fluid recovery, potential absorption (recovery in receptor fluid and skin except tape strips 1 and 2) and mass balance of caffeine was 6.99%, 7.14% and 99.13%, respectively, across all and 3.87%, 3.96% and 99.00% in the subset of five laboratories.
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Affiliation(s)
| | | | - Wilfred Maas
- Charles River Laboratories, Den Bosch, the Netherlands
| | - Frank Toner
- Charles River Laboratories, Tranent, United Kingdom
| | - Leanne Page
- Charles River Laboratories, Tranent, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | - Philip Fisher
- Bayer SAS, Bayer Crop Science, Sophia, Antipolis, France
| | | | | | | | - Tao Chen
- University of Surrey, Guildford, United Kingdom
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De Winne K, Sorber L, Lambin S, Siozopoulou V, Beniuga G, Dedeurwaerdere F, D'Haene N, Habran L, Libbrecht L, Van Huysse J, Weynand B, Wouters K, Pauwels P, Zwaenepoel K. Immunohistochemistry as a screening tool for NTRK gene fusions: results of a first Belgian ring trial. Virchows Arch 2021; 478:283-91. [PMID: 32915263 DOI: 10.1007/s00428-020-02921-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 07/03/2020] [Accepted: 09/01/2020] [Indexed: 01/07/2023]
Abstract
A Belgian ring trial for pan-TRK immunohistochemistry (IHC) staining was organised to harmonise pan-TRK IHC staining protocols and interpretation. As a reference method, the VENTANA pan-TRK Assay (clone EPR17341) on the Benchmark Ultra platform was selected. Six samples were selected: 2 negative, 2 fusion positive and 2 samples with wild-type endogenous TRK expression. Each participating laboratory stained the slides using their routine pan-TRK IHC and reported their results. In addition, they were asked to return one TRK-stained slide from each case. The coordinating lab evaluated these slides, compared them with the reference method and scored them. Two clones were used during the ring trial: A7H6R (Cell Signaling) and EPR17341 (Abcam/Ventana). Seven protocols achieved a sufficient performance mark, and three labs were advised to further optimise the protocol. Interpretation of pan-TRK IHC proved to be challenging in cases with physiological TRK expression. In addition, depending on the NTRK fusion partner, the staining can vary strongly in both intensity and staining pattern. Labs using the Ventana ready-to-use system based on the EPR17341 clone and using the recommended protocol settings scored best. However, given some small optimisation, all labs scored well on the technical staining and the succeeding evaluation.
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Stubberfield E, Pringle M, Landén A, Veldman KT, Geurts Y, Jouy E, Le Devendec L, Rubin JE, Kulathunga DGRS, Kristensen KA, Chanter J, Bollard A, Johnson P, Maycock J, Habighorst-Blome K, Rohde J, Card RM. Validation of an antimicrobial susceptibility testing protocol for Brachyspira hyodysenteriae and Brachyspira pilosicoli in an international ring trial. Vet Microbiol 2020; 244:108645. [PMID: 32402332 DOI: 10.1016/j.vetmic.2020.108645] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 02/27/2020] [Accepted: 03/17/2020] [Indexed: 10/24/2022]
Abstract
Brachyspira hyodysenteriae and Brachyspira pilosicoli cause economically important enteric disease in pigs. Treatment of these infections often includes antimicrobial administration, which can be most effective when therapeutic options are informed by antimicrobial susceptibility testing data. Here we describe a method for broth dilution antimicrobial susceptibility testing of these bacteria, both of which are difficult to culture in vitro. The protocol was evaluated for its fitness for use in an inter-laboratory ring trial involving eight laboratories from seven countries, and employing eleven test strains (5 Brachyspira hyodysenteriae including the type strain B78T and 6 Brachyspira pilosicoli) and six antibiotics. Overall intra- and inter-laboratory reproducibility of this method was very good (>90 % MICs at mode +/- 1 log2). Whole genome sequencing revealed good correspondence between reduced susceptibility and the presence of previously defined antimicrobial resistance determinants. Interestingly, lnu(C) was identified in B. pilosicoli isolates with elevated MICs of lincomycin, whilst tva(B) was associated with elevated MICs of pleuromutilins in this species. We designated two new control strains with MICs lying within currently tested ranges, including for the pleuromutilins, in contrast to the control strain B. hyodysenteriae B78T. These were deposited at the DSMZ-German Collection of Microorganisms and Cell Cultures GmbH. The validation of a standard protocol and identification of new control strains facilitates comparisons between studies, establishment of robust interpretative criteria, and ultimately contributes to rational antimicrobial use when treating infected livestock.
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Affiliation(s)
- E Stubberfield
- Department of Bacteriology, Animal and Plant Health Agency, Weybridge, Surrey, KT15 3NB, United Kingdom
| | - M Pringle
- Department of Animal Health and Antimicrobial Strategies, National Veterinary Institute, SVA, SE-751 89, Uppsala, Sweden
| | - A Landén
- Department of Animal Health and Antimicrobial Strategies, National Veterinary Institute, SVA, SE-751 89, Uppsala, Sweden
| | - K T Veldman
- Department of Bacteriology and Epidemiology, Wageningen Bioveterinary Research, Lelystad, Netherlands
| | - Y Geurts
- Department of Bacteriology and Epidemiology, Wageningen Bioveterinary Research, Lelystad, Netherlands
| | - E Jouy
- Mycoplasmology-Bacteriology-Antimicrobial Resistance Unit, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Ploufragan, France
| | - L Le Devendec
- Mycoplasmology-Bacteriology-Antimicrobial Resistance Unit, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Ploufragan, France
| | - J E Rubin
- Department of Veterinary Microbiology, University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan, S7N 5B4, Canada
| | - D G R S Kulathunga
- Department of Veterinary Microbiology, University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan, S7N 5B4, Canada
| | - K A Kristensen
- National Food Institute, Technical University of Denmark, 2800, Kgs. Lyngby, Denmark
| | - J Chanter
- Animal and Plant Health Agency, Starcross VIC, Devon, United Kingdom
| | - A Bollard
- VETQAS Quality Assurance Unit, Animal and Plant Health Agency, Sutton Bonington, Leicestershire, United Kingdom
| | - P Johnson
- VETQAS Quality Assurance Unit, Animal and Plant Health Agency, Sutton Bonington, Leicestershire, United Kingdom
| | - J Maycock
- VETQAS Quality Assurance Unit, Animal and Plant Health Agency, Sutton Bonington, Leicestershire, United Kingdom
| | - K Habighorst-Blome
- Institute for Microbiology, University of Veterinary Medicine, Foundation, Bischofsholer Damm 15, 30173, Hannover, Germany
| | - J Rohde
- Institute for Microbiology, University of Veterinary Medicine, Foundation, Bischofsholer Damm 15, 30173, Hannover, Germany
| | - R M Card
- Department of Bacteriology, Animal and Plant Health Agency, Weybridge, Surrey, KT15 3NB, United Kingdom.
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Wernike K, Beer M. Diagnostics in the context of an eradication program: Results of the German bovine viral diarrhea proficiency trial. Vet Microbiol 2019; 239:108452. [PMID: 31767099 DOI: 10.1016/j.vetmic.2019.108452] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Revised: 10/04/2019] [Accepted: 10/06/2019] [Indexed: 11/18/2022]
Abstract
Bovine viral diarrhea (BVD), one of the most important infectious diseases in cattle, causes major economic losses and significant impact on animal welfare worldwide. The major source for virus spread is persistently infected, immunotolerant calves and, therefore, their early identification is of utmost importance for disease prevention. Here, a ring trial was initiated to control the performance of diagnostic tests used in German regional laboratories in charge of the diagnostics within the country's BVD control program. A panel of five ear notch and five serum samples was provided for virological analysis. By an antigen ELISA, which was applied 26 times, the status of every sample was correctly identified in any case. In addition, a total of 54 real-time RT-PCR result sets was generated and also in most cases correctly classified. In addition to the virological test panel, a set of six sera and four milk samples was sent to the participating laboratories to be analyzed by serological methods. With serum neutralization tests, an excellent diagnostic sensitivity was achieved. However, one serum and both milk samples - positive for BVDV antibodies - repeatedly tested false negative by some of the used ELISA kits. All negative serum and milk samples were correctly identified by every commercial antibody ELISA. In conclusion, the BVDV proficiency test demonstrated that the used antigen/genome test systems allowed predominantly reliable diagnostics, while for four of the applied nine antibody ELISA kits adjustments are recommended.
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Affiliation(s)
- Kerstin Wernike
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald - Insel Riems, Germany.
| | - Martin Beer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald - Insel Riems, Germany
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Wisselink HJ, Smid B, Plater J, Ridley A, Andersson AM, Aspán A, Pohjanvirta T, Vähänikkilä N, Larsen H, Høgberg J, Colin A, Tardy F. A European interlaboratory trial to evaluate the performance of different PCR methods for Mycoplasma bovis diagnosis. BMC Vet Res 2019; 15:86. [PMID: 30866933 PMCID: PMC6417145 DOI: 10.1186/s12917-019-1819-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 02/25/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Several species-specific PCR assays, based on a variety of target genes are currently used in the diagnosis of Mycoplasma bovis infections in cattle herds with respiratory diseases and/or mastitis. With this diversity of methods, and the development of new methods and formats, regular performance comparisons are required to ascertain diagnostic quality. The present study compares PCR methods that are currently used in six national veterinary institutes across Europe. Three different sample panels were compiled and analysed to assess the analytical specificity, analytical sensitivity and comparability of the different PCR methods. The results were also compared, when appropriate, to those obtained through isolation by culture. The sensitivity and comparability panels were composed of samples from bronchoalveolar fluids of veal calves, artificially contaminated or naturally infected, and hence the comparison of the different methods included the whole workflow from DNA extraction to PCR analysis. RESULTS The participating laboratories used i) five different DNA extraction methods, ii) seven different real-time and/or end-point PCRs targeting four different genes and iii) six different real-time PCR platforms. Only one commercial kit was assessed; all other PCR assays were in-house tests adapted from published methods. The analytical specificity of the different PCR methods was comparable except for one laboratory where Mycoplasma agalactiae was tested positive. Frequently, weak-positive results with Ct values between 37 and 40 were obtained for non-target Mycoplasma strains. The limit of detection (LOD) varied from 10 to 103 CFU/ml to 103 and 106 CFU/ml for the real-time and end-point assays, respectively. Cultures were also shown to detect concentrations down to 102 CFU/ml. Although Ct values showed considerable variation with naturally infected samples, both between laboratories and tests, the final result interpretation of the samples (positive versus negative) was essentially the same between the different laboratories. CONCLUSION With a few exceptions, all methods used routinely in the participating laboratories showed comparable performance, which assures the quality of diagnosis, despite the multiplicity of the methods.
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Affiliation(s)
- Henk J Wisselink
- Wageningen Bioveterinary Research, P.O. Box 65, 8200 AB, Lelystad, The Netherlands.
| | - Bregtje Smid
- Wageningen Bioveterinary Research, P.O. Box 65, 8200 AB, Lelystad, The Netherlands
| | - Jane Plater
- Animal and Plant Health Agency (APHA), Surrey, UK
| | - Anne Ridley
- Animal and Plant Health Agency (APHA), Surrey, UK
| | | | - Anna Aspán
- National Veterinary Institute (SVA), Uppsala, Sweden
| | | | | | - Helene Larsen
- National Veterinary Institute, Technical University of Denmark, Lyngby, Denmark
| | - Jonas Høgberg
- National Veterinary Institute, Technical University of Denmark, Lyngby, Denmark
| | - Adélie Colin
- Anses, Lyon Laboratory, JRU Ruminants Mycoplasmoses, Anses, VetAgro Sup, University of Lyon, Lyon, France
| | - Florence Tardy
- Anses, Lyon Laboratory, JRU Ruminants Mycoplasmoses, Anses, VetAgro Sup, University of Lyon, Lyon, France
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8
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Althof N, Trojnar E, Böhm T, Burkhardt S, Carl A, Contzen M, Kilwinski J, Mergemeier S, Moor D, Mäde D, Johne R. Interlaboratory Validation of a Method for Hepatitis E Virus RNA Detection in Meat and Meat Products. Food Environ Virol 2019; 11:1-8. [PMID: 30465253 DOI: 10.1007/s12560-018-9360-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 11/12/2018] [Indexed: 05/25/2023]
Abstract
Increasing numbers of hepatitis E cases are currently recognized in many European countries. The zoonotic hepatitis E virus (HEV) genotype 3 mainly circulates in domestic pigs and wild boars, and can be transmitted to humans via consumption of insufficiently heated meat or meat products produced from those animals. Here, a detailed protocol for detection of HEV RNA in meat products is provided, which is based on the method originally described by Szabo et al. (Intl J Food Microbiol 215:149-156, 2015). It consists of a TRI Reagent®/chloroform-based food matrix homogenization, a silica bead-based RNA extraction and a real-time RT-PCR-based RNA detection. The method was further validated in a ring trial with nine independent laboratories using pork liver sausage samples artificially contaminated with different amounts of HEV. The results indicate sufficient sensitivity, specificity, and accuracy of the method for its broad future use in survey studies, routine food control or outbreak investigations.
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Affiliation(s)
- Nadine Althof
- German Federal Institute for Risk Assessment, Berlin, Germany
| | - Eva Trojnar
- German Federal Institute for Risk Assessment, Berlin, Germany
| | - Thomas Böhm
- Landesbetrieb Hessisches Landeslabor, Kassel, Germany
| | | | - Anja Carl
- Bayrisches Landesamt für Gesundheit und Lebensmittelsicherheit, Erlangen, Germany
| | - Matthias Contzen
- Chemisches und Veterinäruntersuchungsamt Stuttgart, Fellbach, Germany
| | - Jochen Kilwinski
- Chemisches und Veterinäruntersuchungsamt Westfalen, Arnsberg, Germany
| | | | - Dominik Moor
- Bundesamt für Lebensmittelsicherheit und Veterinärwesen, Bern, Switzerland
| | - Dietrich Mäde
- Landesamt für Verbraucherschutz Sachsen-Anhalt, Halle (Saale), Germany
| | - Reimar Johne
- German Federal Institute for Risk Assessment, Berlin, Germany.
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9
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Buck A, Heijs B, Beine B, Schepers J, Cassese A, Heeren RMA, McDonnell LA, Henkel C, Walch A, Balluff B. Round robin study of formalin-fixed paraffin-embedded tissues in mass spectrometry imaging. Anal Bioanal Chem 2018; 410:5969-5980. [PMID: 29968108 PMCID: PMC6096706 DOI: 10.1007/s00216-018-1216-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 05/14/2018] [Accepted: 06/21/2018] [Indexed: 12/12/2022]
Abstract
Mass spectrometry imaging (MSI) has provided many results with translational character, which still have to be proven robust in large patient cohorts and across different centers. Although formalin-fixed paraffin-embedded (FFPE) specimens are most common in clinical practice, no MSI multicenter study has been reported for FFPE samples. Here, we report the results of the first round robin MSI study on FFPE tissues with the goal to investigate the consequences of inter- and intracenter technical variation on masking biological effects. A total of four centers were involved with similar MSI instrumentation and sample preparation equipment. A FFPE multi-organ tissue microarray containing eight different types of tissue was analyzed on a peptide and metabolite level, which enabled investigating different molecular and biological differences. Statistical analyses revealed that peptide intercenter variation was significantly lower and metabolite intercenter variation was significantly higher than the respective intracenter variations. When looking at relative univariate effects of mass signals with statistical discriminatory power, the metabolite data was more reproducible across centers compared to the peptide data. With respect to absolute effects (cross-center common intensity scale), multivariate classifiers were able to reach on average > 90% accuracy for peptides and > 80% for metabolites if trained with sufficient amount of cross-center data. Overall, our study showed that MSI data from FFPE samples could be reproduced to a high degree across centers. While metabolite data exhibited more reproducibility with respect to relative effects, peptide data-based classifiers were more directly transferable between centers and therefore more robust than expected. Graphical abstract ᅟ.
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Affiliation(s)
- Achim Buck
- Research Unit Analytical Pathology, Helmholtz Zentrum München, 85764, Oberschleißheim, Germany
| | - Bram Heijs
- Center for Proteomics and Metabolomics, Leiden University Medical Center, 2333 ZA, Leiden, The Netherlands
| | - Birte Beine
- Medizinisches Proteom-Center, Ruhr-Universität Bochum, 44801, Bochum, Germany
- Leibniz-Institut für Analytische Wissenschaften - ISAS-e.V, 44139, Dortmund, Germany
| | - Jan Schepers
- Department of Methodology and Statistics, Faculty of Psychology and Neuroscience, Maastricht University, 6200 MD, Maastricht, The Netherlands
| | - Alberto Cassese
- Department of Methodology and Statistics, Faculty of Psychology and Neuroscience, Maastricht University, 6200 MD, Maastricht, The Netherlands
| | - Ron M A Heeren
- The Maastricht MultiModal Molecular Imaging Institute (M4I), Maastricht University, Universiteitssingel 50, Pigeon Hole 57, P.O. Box 616, 6200 MD, Maastricht, The Netherlands
| | - Liam A McDonnell
- Center for Proteomics and Metabolomics, Leiden University Medical Center, 2333 ZA, Leiden, The Netherlands
- Fondazione Pisana per la Scienza ONLUS, 56017, Pisa, Italy
| | - Corinna Henkel
- Medizinisches Proteom-Center, Ruhr-Universität Bochum, 44801, Bochum, Germany
- Bruker Daltonik, Bremen, Germany
| | - Axel Walch
- Research Unit Analytical Pathology, Helmholtz Zentrum München, 85764, Oberschleißheim, Germany
| | - Benjamin Balluff
- The Maastricht MultiModal Molecular Imaging Institute (M4I), Maastricht University, Universiteitssingel 50, Pigeon Hole 57, P.O. Box 616, 6200 MD, Maastricht, The Netherlands.
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10
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Dill V, Eschbaumer M, Beer M, Hoffmann B. Inter-laboratory validation of foot-and-mouth disease diagnostic capability in Germany. Vet Microbiol 2017; 203:62-67. [PMID: 28619169 DOI: 10.1016/j.vetmic.2017.03.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 02/28/2017] [Accepted: 03/01/2017] [Indexed: 11/25/2022]
Abstract
Germany has been free from foot-and-mouth disease virus (FMDV) without vaccination since 1992, but diagnostic capability at regional laboratories is maintained for FMDV exclusion in suspect cases and as surge capacity for outbreak preparedness. A proficiency test was initiated in 2015 to evaluate the diagnostic performance of 20 regional veterinary laboratories. A panel of two identical samples of FMDV genome for real-time reverse transcription polymerase chain reaction (RT-PCR), four lyophilized bovine sera for antibody detection and eight samples of inactivated vaccine antigen for analysis with a lateral-flow device (LFD) were tested with the systems routinely used at the participating institutions. With only one exception, all laboratories reliably detected viral RNA with two real-time RT-PCR assays down to a dilution of 10(-4) of the original material. The LFD pen-side test was evaluated at 8 of 20 laboratories, and FMDV antigen was detected by all participants down to a dilution of 1:81. Serological diagnosis was also very consistent at most participating institutions. Very few false-negative results were returned for the diluted positive sera, and testing of a large cohort of negative samples demonstrated a high specificity of over 99% for the two commercial ELISA kits used (PrioCHECK® FMDV NS and ID Screen® FMD NSP). In conclusion, the proficiency test demonstrated the reliable and robust FMDV diagnostic capability of the German regional veterinary diagnostic laboratories. Furthermore, the suitability of the commercially available ELISA systems for the detection of FMDV-specific antibodies was confirmed. Proficiency tests are an important quality assurance measure for transboundary diseases like FMDV where diagnostic capacity in free countries has to be available at the highest possible standard.
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Affiliation(s)
- Veronika Dill
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany
| | - Michael Eschbaumer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany.
| | - Martin Beer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany
| | - Bernd Hoffmann
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany
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11
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Strandbygaard B, Lavazza A, Lelli D, Blanchard Y, Grasland B, Poder SL, Rose N, Steinbach F, van der Poel WHM, Widén F, Belsham GJ, Bøtner A. Inter-laboratory study to characterize the detection of serum antibodies against porcine epidemic diarrhoea virus. Vet Microbiol 2016; 197:151-160. [PMID: 27938678 PMCID: PMC7117164 DOI: 10.1016/j.vetmic.2016.11.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 11/17/2016] [Accepted: 11/20/2016] [Indexed: 10/25/2022]
Abstract
Porcine epidemic diarrhea virus (PEDV) has caused extensive economic losses to pig producers in many countries. It was recently introduced, for the first time, into North America and outbreaks have occurred again in multiple countries within Europe as well. To assess the properties of various diagnostic assays for the detection of PEDV infection, multiple panels of porcine sera have been shared and tested for the presence of antibodies against PEDV in an inter-laboratory ring trial. Different laboratories have used a variety of "in house" ELISAs and also one commercial assay. The sensitivity and specificity of each assay has been estimated using a Bayesian analysis applied to the ring trial results obtained with the different assays in the absence of a gold standard. Although different characteristics were found, it can be concluded that each of the assays used can detect infection of pigs at a herd level by either the early European strains of PEDV or the recently circulating strains (INDEL and non-INDEL). However, not all the assays seem suitable for demonstrating freedom from disease in a country. The results from individual animals, especially when the infection has occurred within an experimental situation, show more variation.
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Affiliation(s)
- Bertel Strandbygaard
- National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave 4771, Denmark.
| | - Antonio Lavazza
- IZSLER - Virology Unit, Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna "Bruno Ubertini" Via Bianchi 7/9, 25124 Brescia, Italy.
| | - Davide Lelli
- IZSLER - Virology Unit, Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna "Bruno Ubertini" Via Bianchi 7/9, 25124 Brescia, Italy.
| | - Yannick Blanchard
- ANSES - Laboratory of Ploufragan-Plouzané - BP 53, 22440 Ploufragan, France; Université Bretagne Loire, Rennes, France.
| | - Béatrice Grasland
- ANSES - Laboratory of Ploufragan-Plouzané - BP 53, 22440 Ploufragan, France; Université Bretagne Loire, Rennes, France.
| | - Sophie Le Poder
- Université Paris-Est, Ecole Nationale Vétérinaire d'Alfort, UMR 1161 Virology, Maisons-Alfort, France; INRA, UMR 1161 Virology, Maisons-Alfort, France; ANSES - Laboratory of Animal Health of Maisons-Alfort - UMR 1161 Virology, 23 avenue du Général de Gaulle, France.
| | - Nicolas Rose
- ANSES - Laboratory of Ploufragan-Plouzané - BP 53, 22440 Ploufragan, France; Université Bretagne Loire, Rennes, France.
| | - Falko Steinbach
- APHA, Dept of Virology, Weybridge, Addlestone, Surrey. KT15 3NB, UK.
| | - Wim H M van der Poel
- Wageningen University and Research Centre, Edelhertweg 15, 8219PH, Lelystad, The Netherlands.
| | - Frederik Widén
- The National Veterinary Institute (SVA), 75189 Uppsala, Sweden.
| | - Graham J Belsham
- National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave 4771, Denmark.
| | - Anette Bøtner
- National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave 4771, Denmark.
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12
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Laroucau K, Colaneri C, Jaÿ M, Corde Y, Drapeau A, Durand B, Zientara S, Beck C. Interlaboratory ring trial to evaluate CFT proficiency of European laboratories for diagnosis of glanders in equids. Vet Rec 2016; 178:632. [PMID: 27122499 DOI: 10.1136/vr.103617] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/07/2016] [Indexed: 11/04/2022]
Abstract
To evaluate the routine complement fixation test (CFT) used to detect Burkholderia mallei antibodies in equine sera, an interlaboratory proficiency test was held with 24 European laboratories, including 22 National Reference Laboratories for glanders. The panels sent to participants were composed of sera with or without B mallei antibodies. This study confirmed the reliability of CFT and highlighted its intralaboratory reproducibility. However, the sensitivity of glanders serodiagnosis and laboratory proficiency may be improved by standardising critical reagents, including antigens, and by developing a standard B mallei serum.
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Affiliation(s)
- K Laroucau
- European Union Reference Laboratory for Equine Diseases, ANSES, Laboratory for Animal Health, Maisons-Alfort, France
| | - C Colaneri
- European Union Reference Laboratory for Equine Diseases, ANSES, Laboratory for Animal Health, Maisons-Alfort, France
| | - M Jaÿ
- Bacterial Zoonosis Unit, Paris-Est University, ANSES, Laboratory for Animal Health, Maisons-Alfort, France
| | - Y Corde
- Bacterial Zoonosis Unit, Paris-Est University, ANSES, Laboratory for Animal Health, Maisons-Alfort, France
| | - A Drapeau
- Bacterial Zoonosis Unit, Paris-Est University, ANSES, Laboratory for Animal Health, Maisons-Alfort, France
| | - B Durand
- Epidemiology Unit, Paris-Est University, ANSES, Laboratory for Animal Health, Maisons-Alfort, France
| | - S Zientara
- European Union Reference Laboratory for Equine Diseases, ANSES, Laboratory for Animal Health, Maisons-Alfort, France
| | - C Beck
- European Union Reference Laboratory for Equine Diseases, ANSES, Laboratory for Animal Health, Maisons-Alfort, France
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13
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Johnson GE, Yamamoto M, Suzuki Y, Adachi H, Kyoya T, Takasawa H, Horibata K, Tsutsumi E, Wada K, Kikuzuki R, Yoshida I, Kimoto T, Maeda A, Narumi K. Measuring reproducibility of dose response data for the Pig-a assay using covariate benchmark dose analysis. Mutat Res Genet Toxicol Environ Mutagen 2016; 811:135-139. [PMID: 27931807 DOI: 10.1016/j.mrgentox.2016.04.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 04/11/2016] [Indexed: 11/28/2022]
Abstract
The reproducibility of the in vivo Pig-a gene mutation test system was assessed across 13 different Japanese laboratories. In each laboratory rats were exposed to the same dosing regimen of N-nitroso-N-ethylurea (ENU), and red blood cells (RBCs) and reticulocytes (RETs) were collected for mutant phenotypic analysis using flow cytometry. Mutant frequency dose response data were analysed using the PROAST benchmark dose (BMD) statistical package. Laboratory was used as a covariate during the analysis to allow all dose responses to be analysed at the same time, with conserved shape parameters. This approach has recently been shown to increase the precision of the BMD analysis, as well as providing a measure of equipotency. This measure of equipotency was used here to demonstrate a reasonable level of interlaboratory reproducibility. Increased reproducibility could have been achieved by increasing the number of cells scored, as this would reduce the number of zero values within the mutant frequency data. Overall, the interlaboratory trial was successful, and these findings support the transferability of the in vivo Pig-a gene mutation assay.
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Affiliation(s)
- George E Johnson
- Swansea University Medical School, Swansea University, SA2 8PP, United Kingdom.
| | - Mika Yamamoto
- Drug Development Toxicology, Drug Safety Research Laboratories, Drug Discovery Research Division, Astellas Pharma Inc., 2-1-6, Kashima, Yodogawa-ku, Osaka 532-8514, Japan
| | - Yuta Suzuki
- Gotemba Laboratory, BoZo Research Center Inc., Gotemba-shi, Shizuoka 412-0039, Japan
| | - Hideki Adachi
- Preclinical Research Laboratories, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugadenaka, Konohana-ku, Osaka 554-0022, Japan
| | - Takahiro Kyoya
- Toxicology Laboratory, Life Science Research Institute, Kumiai Chemical Industry, Co., Ltd., 3360 Kamo, Kikugawa-shi, Shizuoka 439-0031, Japan
| | - Hironao Takasawa
- Safety Assessment Department, Nonclinical Research Center, Drug Development Service Segment, LSI Medience Corporation, 14-1 Sunayama, Kamisu-shi, Ibaraki 314-0255, Japan
| | - Katsuyoshi Horibata
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Eri Tsutsumi
- Quality Assurance Division, Safety Science Institute, Suntory Business Expert Limited, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
| | - Kunio Wada
- Toxicology Division, The Institute of Environmental Toxicology, 4321, Uchimoriya-machi, Joso-shi, Ibaraki 303-0043, Japan
| | - Ryuta Kikuzuki
- Drug Safety and Pharmacokinetics Laboratories, Taisho Pharmaceutical Co., Ltd., 1-403, Yoshino-cho, Kita-ku, Saitama-shi 331-9530, Japan
| | - Ikuma Yoshida
- Drug Safety Research Laboratories, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 26-1, Muraoka-Higashi 2-chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Takafumi Kimoto
- Pharmaceutical Development Research Laboratories, Teijin Institute for Bio-medical Research, Teijin Pharma Limited, 4-3-2 Asahigaoka, Hino-shi, Tokyo 191-8512, Japan
| | - Akihisa Maeda
- Toxicology and Pharmacokinetics Laboratories, Pharmaceutical Research Laboratories, Toray Industries Inc., 6-10-1 Tebiro, Kamakura, Kanagawa 248-8555, Japan
| | - Kazunori Narumi
- Yakult Honsha Co., Ltd., 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
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14
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Cauchard J, Soldan A, Madeline A, Johnson P, Büscher P, Petry S. Inter-laboratory ring trials to evaluate serological methods for dourine diagnosis. Vet Parasitol 2014; 205:70-6. [PMID: 25015543 DOI: 10.1016/j.vetpar.2014.06.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 06/13/2014] [Accepted: 06/19/2014] [Indexed: 10/25/2022]
Abstract
To evaluate the reproducibility of routine serological methods to detect Trypanosoma equiperdum antibodies in equine sera, two inter-laboratory ring trials were organized involving 22 European and 4 non-European reference laboratories for dourine. The serological methods were the complement fixation test (CFT; 25 laboratories) and the indirect fluorescent antibody test (IFAT; 4 laboratories). Three of the laboratories applied both these methods. The sample panels were composed of sera that were negative, positive or suspected for dourine. Of the negative sera, one was from a donkey naturally infected with Trypanosoma evansi. This study confirmed the reliability of CFT and highlighted its inter-laboratory reproducibility for known T. equiperdum positive and negative sera. However the reproducibility was less good for sera positive for T. evansi or of unknown status, e.i. nine out of 22 laboratories observed a false-positive result with the T. evansi-positive serum, whether by CFT or IFAT. This interesting result suggests that the specificity of dourine serodiagnosis may be improved by standardizing the critical reagents, including antigens and by developing a standard T. equiperdum serum which could be used calibrate test systems across multiple laboratories. Trial data confirmed seropositivity in one of the three horses suspected of dourine. It may be beneficial to generalize the use of a suitable low-titer serum control, derived from a standard serum in order to standardize the method's detection limit.
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Affiliation(s)
- Julien Cauchard
- ANSES, Dozulé laboratory for equine diseases, Bacteriology and Parasitology Unit, Goustranville, France
| | - Andrew Soldan
- Animal Health and Veterinary Laboratories Agency, Quality Assurance Unit, Loughborough, United Kingdom
| | - Anthony Madeline
- ANSES, Dozulé laboratory for equine diseases, Bacteriology and Parasitology Unit, Goustranville, France
| | - Paula Johnson
- Animal Health and Veterinary Laboratories Agency, Quality Assurance Unit, Loughborough, United Kingdom
| | - Philippe Büscher
- Institute of Tropical Medicine, Department of Biomedical Sciences, Nationalestraat 155, B-2000 Antwerp, Belgium
| | - Sandrine Petry
- ANSES, Dozulé laboratory for equine diseases, Bacteriology and Parasitology Unit, Goustranville, France.
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