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Podzhilkova A, Nagl C, Hummel K, Bindslev-Jensen C, Eller E, Mortz CG, Bublin M, Hoffmann-Sommergruber K. Poppy Seed Allergy: Molecular Diagnosis and Cross-Reactivity with Tree Nuts. J Allergy Clin Immunol Pract 2024:S2213-2198(24)00466-5. [PMID: 38734371 DOI: 10.1016/j.jaip.2024.05.001] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 04/24/2024] [Accepted: 05/01/2024] [Indexed: 05/13/2024]
Abstract
BACKGROUND Poppy seed (PS) can be a cause of severe allergic reactions, especially in individuals with concurrent allergy to tree nuts and other seeds, but diagnostic criteria and sensitization patterns are lacking. OBJECTIVE To assess the role of PS extract and individual allergens in diagnosing PS allergy and their cross-reactivities with tree nuts and buckwheat. METHODS Our retrospective study included 36 PS-sensitized patients; 10 with positive and 26 with a negative oral food challenge (OFC). We identified individual PS allergens and compared the diagnostic performance of sIgE to PS extract to its allergens. Cross-reactivities between PS and related allergens from other seeds was assessed by competitive ELISA. RESULTS We identified four novel PS allergens: Pap s 1 (vicilin), Pap s 1 (27-424) (α-hairpinin), Pap s 2 (legumin), and Pap s 3 (small hydrophilic seed protein). Positive OFC correlated with higher PS-sIgE levels and elevated sIgE levels for the PS allergens, except for Pap s 3. PS and α-hairpinin-sIgE effectively differentiated allergic from tolerant patients, with AUC values of 0.95 and 0.94. PS-sIgE >10.00 kUA/L exhibited 90% sensitivity and 73% specificity, while α-hairpinin -sIgE >2.60 kUA/L showed 100% sensitivity and 77% specificity. PS vicilin and legumin highly cross-reacted with hazelnut and buckwheat homologues, while α-hairpinin-sIgE cross-reacted with the related almond allergen. CONCLUSIONS This is the most extensive study on poppy seed allergy to date. Poppy seed and α-hairpinin-sIgE are highly sensitive indicators of clinical reactivity to poppy seeds, while vicilin and legumin-sIgE contribute to concurrent sensitization to hazelnut and buckwheat.
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Affiliation(s)
- Aleksandra Podzhilkova
- Institute of Pathophysiology and Allergy Research, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Christoph Nagl
- Institute of Pathophysiology and Allergy Research, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Karin Hummel
- VetCore Facility for Research, University of Veterinary Medicine, Vienna, Austria
| | - Carsten Bindslev-Jensen
- Department of Dermatology and Allergy Center, Odense Research Center for Anaphylaxis (ORCA), Odense University Hospital, Odense, Denmark
| | - Esben Eller
- Department of Dermatology and Allergy Center, Odense Research Center for Anaphylaxis (ORCA), Odense University Hospital, Odense, Denmark
| | - Charlotte G Mortz
- Department of Dermatology and Allergy Center, Odense Research Center for Anaphylaxis (ORCA), Odense University Hospital, Odense, Denmark
| | - Merima Bublin
- Institute of Pathophysiology and Allergy Research, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria.
| | - Karin Hoffmann-Sommergruber
- Institute of Pathophysiology and Allergy Research, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
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Lind A, Freyhult E, de Jesus Cortez F, Ramelius A, Bennet R, Robinson PV, Seftel D, Gebhart D, Tandel D, Maziarz M, Larsson HE, Lundgren M, Carlsson A, Nilsson AL, Fex M, Törn C, Agardh D, Tsai CT, Lernmark Å. Childhood screening for type 1 diabetes comparing automated multiplex Antibody Detection by Agglutination-PCR (ADAP) with single plex islet autoantibody radiobinding assays. EBioMedicine 2024; 104:105144. [PMID: 38723553 PMCID: PMC11090024 DOI: 10.1016/j.ebiom.2024.105144] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 04/16/2024] [Accepted: 04/18/2024] [Indexed: 05/16/2024] Open
Abstract
BACKGROUND Two or more autoantibodies against either insulin (IAA), glutamic acid decarboxylase (GADA), islet antigen-2 (IA-2A) or zinc transporter 8 (ZnT8A) denote stage 1 (normoglycemia) or stage 2 (dysglycemia) type 1 diabetes prior to stage 3 type 1 diabetes. Automated multiplex Antibody Detection by Agglutination-PCR (ADAP) assays in two laboratories were compared to single plex radiobinding assays (RBA) to define threshold levels for diagnostic specificity and sensitivity. METHODS IAA, GADA, IA-2A and ZnT8A were analysed in 1504 (54% females) population based controls (PBC), 456 (55% females) doctor's office controls (DOC) and 535 (41% females) blood donor controls (BDC) as well as in 2300 (48% females) patients newly diagnosed (1-10 years of age) with stage 3 type 1 diabetes. The thresholds for autoantibody positivity were computed in 100 10-fold cross-validations to separate patients from controls either by maximizing the χ2-statistics (chisq) or using the 98th percentile of specificity (Spec98). Mean and 95% CI for threshold, sensitivity and specificity are presented. FINDINGS The ADAP ROC curves of the four autoantibodies showed comparable AUC in the two ADAP laboratories and were higher than RBA. Detection of two or more autoantibodies using chisq showed 0.97 (0.95, 0.99) sensitivity and 0.94 (0.91, 0.97) specificity in ADAP compared to 0.90 (0.88, 0.95) sensitivity and 0.97 (0.94, 0.98) specificity in RBA. Using Spec98, ADAP showed 0.92 (0.89, 0.95) sensitivity and 0.99 (0.98, 1.00) specificity compared to 0.89 (0.77, 0.86) sensitivity and 1.00 (0.99, 1.00) specificity in the RBA. The diagnostic sensitivity and specificity were higher in PBC compared to DOC and BDC. INTERPRETATION ADAP was comparable in two laboratories, both comparable to or better than RBA, to define threshold levels for two or more autoantibodies to stage type 1 diabetes. FUNDING Supported by The Leona M. and Harry B. Helmsley Charitable Trust (grant number 2009-04078), the Swedish Foundation for Strategic Research (Dnr IRC15-0067) and the Swedish Research Council, Strategic Research Area (Dnr 2009-1039). AL was supported by the DiaUnion collaborative study, co-financed by EU Interreg ÖKS, Capital Region of Denmark, Region Skåne and the Novo Nordisk Foundation.
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Affiliation(s)
- Alexander Lind
- Department of Clinical Sciences, Lund University CRC, Malmö, Sweden
| | - Eva Freyhult
- Department of Cell and Molecular Biology, National Bioinformatics Infrastructure Sweden, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | | | - Anita Ramelius
- Department of Clinical Sciences, Lund University CRC, Malmö, Sweden
| | - Rasmus Bennet
- Department of Clinical Sciences, Lund University CRC, Malmö, Sweden
| | | | - David Seftel
- Enable Biosciences Inc., South San Francisco, CA, USA
| | - David Gebhart
- Enable Biosciences Inc., South San Francisco, CA, USA
| | | | - Marlena Maziarz
- Department of Clinical Sciences, Lund University CRC, Malmö, Sweden
| | | | - Markus Lundgren
- Department of Clinical Sciences, Lund University CRC, Malmö, Sweden
| | | | | | - Malin Fex
- Department of Clinical Sciences, Lund University CRC, Malmö, Sweden
| | - Carina Törn
- Department of Clinical Sciences, Lund University CRC, Malmö, Sweden
| | - Daniel Agardh
- Department of Clinical Sciences, Lund University CRC, Malmö, Sweden
| | | | - Åke Lernmark
- Department of Clinical Sciences, Lund University CRC, Malmö, Sweden.
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3
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Andrade RS, Oliveira MMD, Bueno Filho JSDS, Ferreira F, Godfroid J, Lage AP, Dorneles EMS. Accuracy of serological tests for bovine brucellosis: A systematic review and meta-analysis. Prev Vet Med 2024; 222:106079. [PMID: 38056065 DOI: 10.1016/j.prevetmed.2023.106079] [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: 05/13/2023] [Revised: 11/09/2023] [Accepted: 11/15/2023] [Indexed: 12/08/2023]
Abstract
The direct methods for diagnosis of bovine brucellosis have several limitations, therefore serological tests are the basis for the diagnosis of the disease. However, a meta-analysis estimating the diagnostic sensitivity (DSe) and diagnostic specificity (DSp) on the main tests used in bovine brucellosis control programs worldwide has not been performed. This systematic review and meta-analysis aimed to estimate the DSe, DSp and thereby accuracy of serological tests individually used in the diagnosis of bovine brucellosis. The databases CABI, Cochrane Library, PubMed/MEDLINE, SciELO, Scopus and Web of Science were used to select articles. The search resulted in 5308 studies, of which 71 were selected for systematic review using quality assessment tools and 65 studies were included in the meta-analysis. For the meta-analysis, 178 assays and 11 different serological tests were considered. To estimate DSe and DSp of the tests, studies were divided according to animal selection for the studies: (1) studies that carried out a random or consecutive selection of participants (noncasecontrol studies) and (2) all studies, including casecontrol studies. Considering only the non-case-control studies to estimate the DSe, the tests that exhibited the best and worst performance were the iELISA test (indirect enzyme immunoassay - bacterial suspension as antigen - BS) (96.5%, 95% CI: 94.1-97.9%) and 2ME (2- mercaptoethanol test) (85.0%, 95% CI: 79.6-89.1%), respectively; while for DSp, the FPA (fluorescence polarization assay) (99, 7%, 95% CI: 99.5-99.8%) and PCFIA tests (protein concentration fluorescence immunoassay) (78.5%, 95% CI: 70.0-85.1%) showed better and worse performance, respectively. Overall, our results showed an overestimation in the DSe and DSp of the eleven serological tests assessed when casecontrol studies were included in the meta-analysis, which is a concern considering its impacts on the time and costs associated with populational diagnosis of the diseases, since several of these tests are routinely used in the control and eradication programs of bovine brucellosis worldwide. Furthermore, the tests that exhibited the best DSe and DSp, iELISA (BS) and FPA, respectively, are relatively easy to perform and interpret and the test which showed the best overall accuracy was FPA.
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Affiliation(s)
- Rafaella Silva Andrade
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
| | - Marina Martins de Oliveira
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
| | | | - Fernando Ferreira
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Jacques Godfroid
- Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway
| | - Andrey Pereira Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Elaine Maria Seles Dorneles
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil.
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Hársfalvi P, Reiczigel J. Profile likelihood confidence interval for the prevalence assessed by an imperfect diagnostic test. Prev Vet Med 2023; 214:105886. [PMID: 36913890 DOI: 10.1016/j.prevetmed.2023.105886] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 01/25/2023] [Accepted: 02/28/2023] [Indexed: 03/05/2023]
Abstract
We present a new confidence interval for the prevalence of a disease for a situation when sensitivity and specificity of the diagnostic test are estimated from validation samples independent of the study sample. The new interval is based on profile likelihood and incorporates an adjustment improving the coverage probability. Its coverage probability and expected length were assessed by simulation and compared to two other methods for this problem, namely those by Lang and Reiczigel (2014) and Flor et al. (2020). Expected length of the new interval is less than that of the Lang and Reiczigel interval while its coverage is about the same. Comparison to the Flor interval resulted in similar expected length but higher coverage probabilities for the new interval. All in all, the new interval proved to be better than both its competitors.
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Affiliation(s)
- Péter Hársfalvi
- University of Veterinary Medicine Budapest, Department of Biostatistics, Budapest, Hungary; BiTrial Clinical Research, Budapest, Hungary.
| | - Jenő Reiczigel
- University of Veterinary Medicine Budapest, Department of Biostatistics, Budapest, Hungary
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Salgadu A, Cheung A, Schibrowski ML, Wawegama NK, Mahony TJ, Stevenson MA, Browning GF, Barnes TS, Firestone SM. Bayesian latent class analysis to estimate the optimal cut-off for the MilA ELISA for the detection of Mycoplasma bovis antibodies in sera, accounting for repeated measures. Prev Vet Med 2022; 205:105694. [PMID: 35751981 DOI: 10.1016/j.prevetmed.2022.105694] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 05/27/2022] [Accepted: 06/08/2022] [Indexed: 10/18/2022]
Abstract
The MilA ELISA has been identified as a highly effective diagnostic tool for the detection of Mycoplasma bovis specific antibodies and has been validated for serological use in previous studies. This study aimed to estimate the optimal cut-off and corresponding estimates of diagnostic sensitivity (DSe) and diagnostic specificity (DSp) of the MilA ELISA for testing bovine serum. Serum samples from 298 feedlot cattle from 14 feedlots across four Australian states were tested on entry into the feedlot and approximately 42 days later. The paired serum samples were tested with the MilA ELISA, BIO K302 (Bio-X Diagnostics, Belgium) and BIO K260 (Bio-X Diagnostics, Belgium). A cut-off of 135 AU was estimated to be optimal using Bayesian latent class analysis with three tests in multiple populations, accounting for conditional dependence between tests. At this cut-off, the DSe and DSp of the MilA ELISA were estimated to be 92.1 % (95 % highest probability density [HPD] interval: 87.4, 95.8) and 95.5 % (95 % HPD: 92.4, 97.8), respectively. The DSes of the BIO K260 and BIO K302 ELISAs were estimated to be 60.5 % (95 % HPD: 54.0, 66.9) and 44.6 % (95 % HPD: 38.7, 50.7), respectively. DSps were 95.6 % (95 % HPD: 92.9, 97.7) and 97.8 % (95 % HPD: 95.9, 99.0), respectively. Mycoplasma bovis seroprevalence was remarkably high at follow-up after 42 days on the feedlots. Overall, this study estimated a cut-off, DSe and DSp for the MilA ELISA with less dependence on prior information than previous analyses and demonstrated that the MilA ELISA has higher DSe than the BIO K260 and BIO K302 assays.
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Affiliation(s)
- Ayesha Salgadu
- Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia
| | - Allison Cheung
- Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia
| | - Meghan L Schibrowski
- The University of Queensland, Centre for Animal Science, Queensland Alliance for Agriculture and Food Innovation, St Lucia and Gatton, Queensland, Australia; The University of Queensland, School of Veterinary Science, Gatton, Queensland, Australia
| | - Nadeeka K Wawegama
- Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia
| | - Timothy J Mahony
- The University of Queensland, Centre for Animal Science, Queensland Alliance for Agriculture and Food Innovation, St Lucia and Gatton, Queensland, Australia
| | - Mark A Stevenson
- Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia
| | - Glenn F Browning
- Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia
| | - Tamsin S Barnes
- The University of Queensland, Centre for Animal Science, Queensland Alliance for Agriculture and Food Innovation, St Lucia and Gatton, Queensland, Australia; The University of Queensland, School of Veterinary Science, Gatton, Queensland, Australia
| | - Simon M Firestone
- Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia.
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Noordin R, Osman E, Kalantari N, Anuar NS, Gorgani-Firouzjaee T, Sithithaworn P, Juri NM, Rahumatullah A. A point-of-care cassette test for detection of Strongyloides stercoralis. Acta Trop 2022; 226:106251. [PMID: 34808116 DOI: 10.1016/j.actatropica.2021.106251] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 10/05/2021] [Accepted: 11/17/2021] [Indexed: 11/26/2022]
Abstract
Strongyloides stercoralis is a parasite that causes strongyloidiasis worldwide. It may lead to a life-long infection in immunocompetent people and hyperinfection in immunosuppressed patients. A point-of-care (POC) rapid test is helpful for patient diagnosis in resource-limited settings and as a detection tool in elimination/control programs. Previously, we reported a rapid IgG4 dipstick test (Ss Rapid®) for Strongyloides suitable for a laboratory setting. A POC cassette format of the test, which is field-applicable, has since been developed. Here, we report on a laboratory-based evaluation of the Ss Rapid® cas sette test on 285 sera. We assessed the diagnostic sensitivity of the Ss Rapid® cas sette with 32 sera, comprising samples from larval and/or DNA positive individuals from three countries. Additionally, we also tested samples from 33 seropositive endemic areas residents. We evaluated the diagnostic specificity of the test using 220 samples, comprising sera from other infections (n = 101), allergy cases with high IgE antibodies (n = 4), and blood donors (n = 115). The test showed high diagnostic sensitivity (97%, 31/32), and all sera of the seropositive endemic residents were reactive. It also showed high diagnostic specificity (94.5%, 208/220), and all false-positive samples tested negative after sera adsorption using recombinant NIE-coated microsphere beads. Additionally, we showed that the test worked with spiked whole blood samples. The study results showed that the SsRapid® cas sette test merits further laboratory and field evaluations.
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Dalen V, Vegsgaard Olsen AS, Jerome CP, Geitung JT, Dahm AEA. Low diagnostic accuracy and inter-observer agreement on CT and MRI in diagnosis of spinal fractures in multiple myeloma. Hematol Rep 2021; 13:9037. [PMID: 34733448 PMCID: PMC8506199 DOI: 10.4081/hr.2021.9037] [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] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 09/10/2021] [Indexed: 11/23/2022] Open
Abstract
Skeletal disease is common in multiple myeloma. We investigated the inter-observer agreement and diagnostic accuracy of spinal fractures diagnosed by computer tomography (CT) and magnetic resonance imaging (MRI) from 12 myeloma patients. Two radiologists independently assessed the images. CT, MRI, and other images were combined to a gold standard. The inter-observer agreement was assessed with Cohen’s kappa. Radiologist 1 diagnosed 20 malignant spinal fractures on CT and 26 on MRI, while radiologist 2 diagnosed 12 malignant spinal fractures on CT and 22 on MRI. In comparison the gold standard diagnosed 10 malignant spinal fractures. The sensitivity for malignant fractures varied from 0.5 to 1 for CT and MRI, and the specificity varied from 0.17 to 0.67. On MRI, the specificity for malignant spinal fractures was 0.17 for both radiologists. The inter-observer agreement for malignant spinal fractures on CT was -0.42 (Cohen’s kappa) and -0.13 for MRI, while for osteoporotic fractures it was -0.24 for CT and 0.53 for MRI. We conclude that malignant spinal fractures were over-diagnosed on CT and MRI. The inter-observer agreement was extremely poor.
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Affiliation(s)
| | | | | | - Jonn-Terje Geitung
- Department of Radiology, Akershus University Hospital, Lørenskog.,Institute of Clinical Medicine, University of Oslo
| | - Anders E A Dahm
- Institute of Clinical Medicine, University of Oslo.,Department of Haematology, Akershus University Hospital, Lørenskog, Norway
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Heuer C, Stevenson MA. Diagnostic test validation studies when there is a perfect reference standard. REV SCI TECH OIE 2021; 40:261-270. [PMID: 34140725 DOI: 10.20506/rst.40.1.3223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Before tools became available to consider diagnostic test validation studies where a 'gold-standard' is not available, new diagnostic tests were compared to a reference standard assumed to be highly accurate if not perfect. This paper reviews such 'traditional' situations with examples and methods of study design and analysis. Three situations are described, two where a perfect reference is available for either positive or negative animals, and one where the reference is perfect for both. Thus, here the authors review circumstances to be considered when validating a diagnostic test with a credible reference standard. An appropriate study design requires an unbiased selection of animals from the population to which a new test will be applied. Examples for calculating sample size and data analysis are provided. Finally, the authors discuss situations where it may be appropriate to include influential variables ('covariates') in a diagnostic test validation study..
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Kostoulas P, Gardner IA, Elschner MC, Denwood M J, Meletis L, Nielsen SS. Examples of proper reporting for evaluation (Stage 2 validation) of diagnostic tests for diseases listed by the World Organisation for Animal Health. REV SCI TECH OIE 2021; 40:287-298. [PMID: 34140743 DOI: 10.20506/rst.40.1.3225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Reporting and design standards are key indicators of the quality of diagnostic accuracy (validation) studies but, with the exception of aquatic animal diseases and paratuberculosis in ruminants, there is limited guidance for designing these studies in animals. There is, therefore, a need for generic guidelines that are based on disease characteristics, such as mode of transmission, latent period and pathogenesis. Comprehensive, clear and transparent reporting of primary test accuracy studies for diseases listed by the World Organisation for Animal Health (OIE) has value for the end users of diagnostic tests and, ultimately, for decision-makers, who require systematic reviews and meta-analysis of multiple tests for specified diseases and testing purposes. The recent publication of reporting standards for Bayesian latent class models, to analyse test-accuracy data from naturally occurring disease events, fills an important gap as these methods are being increasingly used for OIE-listed diseases. Adherence to design and reporting standards, as well as to guidelines, helps to ensure that research funding for test validation studies is used appropriately and that the strengths and limitations of single tests or test combinations are made clear to test users. The authors provide a review of key points that are often overlooked or misinterpreted in test validation studies, as well as two concrete examples of good practice for use as a reference point for future studies.
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Caraguel CGB, Colling A. Diagnostic likelihood ratio - the next-generation of diagnostic test accuracy measurement. REV SCI TECH OIE 2021; 40:299-309. [PMID: 34140723 DOI: 10.20506/rst.40.1.3226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
To select, interpret, and assess the fitness-for-purpose of diagnostic tests, we need to compare the likelihoods of test results being true vs. false across both infected and non-infected individuals. Diagnostic sensitivity (DSe) and specificity (DSp) report the accuracy of classification in infected and non-infected individuals separately and do not compare these likelihoods directly. Positive and negative predictive values combine these likelihoods, but they also heavily depend on the prevalence in the tested populations and, therefore, cannot be generalised. We propose the adoption of the diagnostic likelihood ratio (LR), which balances the likelihoods of true vs. false results and is population independent. As a relative measure, LR ignores the absolute accuracy of tests, and two tests with different accuracy profiles may have the same LR. This can be easily mitigated by using listed complementary measures of accuracy, including DSe and DSp, or ancillary selection criteria. Overall, LR is a more relevant and universal measure of diagnostic test accuracy, which makes it the logical next-generation measure to adopt. We illustrate the applications and benefits of LR using three assays certified by the World Organisation for Animal Health as serological tests for bovine tuberculosis.
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Henao-Diaz A, Zhang M, Giménez-Lirola L, Ramirez E, Gauger P, Baum DH, Clavijo MJ, Rotolo M, Main RG, Zimmerman J. Adapting a porcine reproductive and respiratory syndrome virus (PRRSV) oral fluid antibody ELISA to routine surveillance. Prev Vet Med 2021; 188:105250. [PMID: 33429134 DOI: 10.1016/j.prevetmed.2020.105250] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 12/20/2020] [Accepted: 12/21/2020] [Indexed: 10/22/2022]
Abstract
Distinct from tests used in diagnostics, tests used in surveillance must provide for detection while avoiding false alarms, i.e., acceptable diagnostic sensitivity but high diagnostic specificity. In the case of the reproductive and respiratory syndrome virus (PRRSV), RNA detection meets these requirements during the period of viremia, but antibody detection better meets these requirements in the post-viremic stage of the infection. Using the manufacturer's recommended cut-off (S/P ≥ 0.4), the diagnostic specificity of a PRRSV oral fluid antibody ELISA (IDEXX Laboratories, Inc., Westbrook, ME, USA) evaluated in this study was previously reported as ≥ 97 %. The aim of this study was to improve its use in surveillance by identifying a cut-off that would increase diagnostic specificity yet minimally impact its diagnostic sensitivity. Three sample sets were used to achieve this goal: oral fluids (n = 596) from pigs vaccinated with a modified live PRRSV vaccine under experimental conditions, field oral fluids (n = 1574) from 94 production sites of known negative status, and field oral fluids (n = 1380) from 211 sites of unknown PRRSV status. Based on the analysis of samples of known status (experimental samples and field samples from negative sites), a cut-off of S/P ≥ 1.0 resulted in a diagnostic specificity of 99.2 (95 % CI: 98.8, 99.7) and a diagnostic sensitivity of 96.5 (95 % CI: 85.2, 99.2). Among 211 sites of unknown status, 81 sites were classified as antibody positive using the manufacturer's cut-off; 20 of which were reclassified as negative using a cut-off of S/P ≥ 1.0. Further analysis showed that these 20 sites had a small proportion of samples (18.0 %) with S/P values just exceeding the manufacturer's cut-off (x̄ = 0.5). Whereas the remainder of positive sites (n = 61) had a high proportion of samples (76.3 %) with high S/P values (x̄ = 6.6). Thus, the manufacturer's cut-off (S/P ≥ 0.4) is appropriate for diagnostic applications, but a cut-off of S/P ≥ 1.0 provided the higher specificity required for surveillance. A previously unreported finding in this study was a statistically significant association between unexpected reactors and specific production sites and animal ages or stages. While beyond the scope of this study, these data suggested that certain animal husbandry or production practices may be associated with non-specific reactions.
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Affiliation(s)
- Alexandra Henao-Diaz
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Iowa State University, Ames, IA, 50011, USA
| | - Min Zhang
- Department of Statistics, College of Liberal Arts and Sciences, Iowa State University, Ames, IA, 50011, USA
| | - Luis Giménez-Lirola
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Iowa State University, Ames, IA, 50011, USA
| | - Esteban Ramirez
- Grupo Porcícola Mexicano Kekén. Mérida, Yucatán, 97100, Mexico
| | - Phil Gauger
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Iowa State University, Ames, IA, 50011, USA
| | - David H Baum
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Iowa State University, Ames, IA, 50011, USA
| | - Maria J Clavijo
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Iowa State University, Ames, IA, 50011, USA; PIC North America, 100 Bluegrass Commons Blvd. Ste. 2200, Hendersonville, TN, 37075, USA
| | - Marisa Rotolo
- PIC North America, 100 Bluegrass Commons Blvd. Ste. 2200, Hendersonville, TN, 37075, USA
| | - Rodger G Main
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Iowa State University, Ames, IA, 50011, USA
| | - Jeffrey Zimmerman
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Iowa State University, Ames, IA, 50011, USA.
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12
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Sølvik UØ, Boija EE, Ekvall S, Jabbour A, Breivik AC, Nordin G, Sandberg S. Performance and user-friendliness of the rapid antigen detection tests QuickVue Dipstick Strep A test and DIAQUICK Strep A Blue Dipstick for pharyngotonsillitis caused by Streptococcus pyogenes in primary health care. Eur J Clin Microbiol Infect Dis 2020; 40:549-558. [PMID: 32996031 PMCID: PMC7892498 DOI: 10.1007/s10096-020-04034-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 05/12/2020] [Accepted: 09/10/2020] [Indexed: 01/09/2023]
Abstract
Sensitivity and specificity of rapid antigen detection tests (RADTs) for detection of group A hemolytic streptococcus (GAS) vary. The purpose is to present the first SKUP (Scandinavian evaluation of laboratory equipment for point of care testing) evaluations concerning the assessment of the diagnostic performance and user-friendliness of two RADTs for detection of GAS when used under real-life conditions in primary health care. Throat samples were collected in duplicates at primary health care centers (PHCCs) from patients with symptoms of pharyngitis. The performance of QuickVue Dipstick Strep A test (307 samples) and DIAQUICK Strep A Blue Dipstick (348 samples) was evaluated using culture results at a clinical microbiology laboratory as comparison. The user-friendliness was evaluated using a questionnaire. The diagnostic sensitivity was 92% (90% confidence interval (CI) 87–96%) and 72% (90% CI 65–79%), while the diagnostic specificity was 86% (90% CI 81–90%) and 98% (90% CI 96–99%) for QuickVue Dipstick Strep A test and DIAQUICK Strep A Blue Dipstick, respectively. Both RADTs obtained acceptable assessments for user-friendliness and fulfilled SKUP’s quality goal for user-friendliness. The diagnostic sensitivity for QuickVue Dipstick Strep A test and the diagnostic specificity for DIAQUICK Strep A Blue Dipstick in this objective and supplier-independent evaluation were higher compared with previous meta-analyses of RADTs. However, the diagnostic specificity for QuickVue Dipstick Strep A test and the diagnostic sensitivity for DIAQUICK Strep A Blue Dipstick were lower compared with previous meta-analyses of RADTs.
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Affiliation(s)
- Una Ørvim Sølvik
- Department of Global Public Health and Primary Care, Faculty of Medicine, University of Bergen, Bergen, Norway.
| | | | | | - Afamia Jabbour
- Department of Clinical Microbiology, Office for Medical Service, Region Skåne, Lund, Sweden
| | - Anne Christin Breivik
- Noklus (Norwegian Organization for Quality Improvement of Laboratory Examinations), Haraldsplass Deaconess Hospital, Bergen, Norway
| | | | - Sverre Sandberg
- Department of Global Public Health and Primary Care, Faculty of Medicine, University of Bergen, Bergen, Norway.,Noklus (Norwegian Organization for Quality Improvement of Laboratory Examinations), Haraldsplass Deaconess Hospital, Bergen, Norway.,Department of Medical Biochemistry and Pharmacology, Haukeland University Hospital, Bergen, Norway
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Flor M, Weiß M, Selhorst T, Müller-Graf C, Greiner M. Comparison of Bayesian and frequentist methods for prevalence estimation under misclassification. BMC Public Health 2020; 20:1135. [PMID: 32689959 PMCID: PMC7370479 DOI: 10.1186/s12889-020-09177-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [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: 02/03/2020] [Accepted: 06/29/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Various methods exist for statistical inference about a prevalence that consider misclassifications due to an imperfect diagnostic test. However, traditional methods are known to suffer from truncation of the prevalence estimate and the confidence intervals constructed around the point estimate, as well as from under-performance of the confidence intervals' coverage. METHODS In this study, we used simulated data sets to validate a Bayesian prevalence estimation method and compare its performance to frequentist methods, i.e. the Rogan-Gladen estimate for prevalence, RGE, in combination with several methods of confidence interval construction. Our performance measures are (i) error distribution of the point estimate against the simulated true prevalence and (ii) coverage and length of the confidence interval, or credible interval in the case of the Bayesian method. RESULTS Across all data sets, the Bayesian point estimate and the RGE produced similar error distributions with slight advantages of the former over the latter. In addition, the Bayesian estimate did not suffer from the RGE's truncation problem at zero or unity. With respect to coverage performance of the confidence and credible intervals, all of the traditional frequentist methods exhibited strong under-coverage, whereas the Bayesian credible interval as well as a newly developed frequentist method by Lang and Reiczigel performed as desired, with the Bayesian method having a very slight advantage in terms of interval length. CONCLUSION The Bayesian prevalence estimation method should be prefered over traditional frequentist methods. An acceptable alternative is to combine the Rogan-Gladen point estimate with the Lang-Reiczigel confidence interval.
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Affiliation(s)
- Matthias Flor
- German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, Berlin, 10589, Germany.
| | - Michael Weiß
- German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, Berlin, 10589, Germany
| | - Thomas Selhorst
- German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, Berlin, 10589, Germany
| | - Christine Müller-Graf
- German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, Berlin, 10589, Germany
| | - Matthias Greiner
- German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, Berlin, 10589, Germany.,University of Veterinary Medicine Hannover, Foundation, Bünteweg 2, Hannover, 30559, Germany
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14
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Li X, Jing H, Liu X, Wang Q, Qiu S, Liu D, Wu S, Lin X. Comparative evaluation of two commercial ELISA kits for detection of antibodies against Akabane virus in cattle serum. BMC Vet Res 2019; 15:408. [PMID: 31711494 PMCID: PMC6849277 DOI: 10.1186/s12917-019-2156-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 04/24/2019] [Accepted: 10/24/2019] [Indexed: 11/10/2022] Open
Abstract
Background Akabane disease (AD), a barrier to international trade for endemic areas with far economic impact on the countries, is caused by Akabane virus (AKAV). Commercial enzyme-linked immunosorbent assay (ELISA) is a commonly used diagnostic technique for AKAV infection, including the IDEXX and IDVET ELISA kits. However, the comparative evaluation of the IDEXX and IDVET ELISA kits has not been published. The object of this study was to evaluate the test performance of the two commercial ELISA kits in detecting serum anti-AKAV antibodies in cattle. Results With virus neutralization test (VNT) as the “relative gold standard”, the diagnostic sensitivity (DSe) was 80.39% (123/153) and 93.46% (143/153) for the IDEXX and IDVET ELISA kit, when suspect samples were included. The diagnostic specificity (DSp) for the IDEXX and IDVET ELISA kit was 93.48% (502/537) and 82.31% (442/537), respectively. Conclusion Both of the tested ELISA kits could be applied to detect antibodies against AKAV in cattle serum. The IDVET ELISA kit had a higher DSe. The IDEXX ELISA kit possessed the higher DSp. These results have important implications if the kits are used to screen herds or individual cattle in surveillance programs, or at border crossings for import-export inspection and quarantine.
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Affiliation(s)
- Xiaolin Li
- Institute of Animal Quarantine, Chinese Academy of Inspection and Quarantine, Beijing, 100176, China
| | - Hongli Jing
- Institute of Animal Quarantine, Chinese Academy of Inspection and Quarantine, Beijing, 100176, China
| | - Xiaofei Liu
- Institute of Animal Quarantine, Chinese Academy of Inspection and Quarantine, Beijing, 100176, China
| | - Qin Wang
- Institute of Animal Quarantine, Chinese Academy of Inspection and Quarantine, Beijing, 100176, China
| | - Songyin Qiu
- Institute of Animal Quarantine, Chinese Academy of Inspection and Quarantine, Beijing, 100176, China
| | - Dandan Liu
- Institute of Animal Quarantine, Chinese Academy of Inspection and Quarantine, Beijing, 100176, China
| | - Shaoqiang Wu
- Institute of Animal Quarantine, Chinese Academy of Inspection and Quarantine, Beijing, 100176, China.
| | - Xiangmei Lin
- Institute of Animal Quarantine, Chinese Academy of Inspection and Quarantine, Beijing, 100176, China.
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Henao-Diaz A, Giménez-Lirola L, Magtoto R, Ji J, Zimmerman J. Evaluation of three commercial porcine reproductive and respiratory syndrome virus (PRRSV) oral fluid antibody ELISAs using samples of known status. Res Vet Sci 2019; 125:113-118. [PMID: 31181347 DOI: 10.1016/j.rvsc.2019.05.019] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 05/29/2019] [Accepted: 05/31/2019] [Indexed: 01/23/2023]
Abstract
Oral fluid (n = 564) samples collected longitudinally from twelve 14-week-old pigs vaccinated with a porcine reproductive and respiratory syndrome virus (PRRSV) modified live vaccine were used to evaluate and compare the diagnostic performance of three commercial PRRSV oral fluid (OF) ELISAs (ELISAs 1, 2, 3). Serum samples (n = 132) tested by a PRRSV serum ELISA (ELISA 'S') provided an antibody response baseline for comparison. The initial analysis comparing the rate of positivity between each OF ELISA versus ELISA 'S' and then pairwise among the three OF ELISAs determined that ELISA 2 (143 false negative results) was significantly different from ELISAs 1 and 3, and from ELISA 'S' (Cochran's Q test, p < 0.05). Receiver operating characteristic (ROC) analyses based on the manufacturers' recommended cutoff were used to estimate the diagnostic sensitivities and specificities of ELISA 1 (100%, 100%), ELISA 2 (62%, 97%), and ELISA 3 (94%, 100%). As an additional aid for interpreting results, the diagnostic sensitivities and specificities of each OF ELISA were also estimated over a range of cutoffs. Area under the curve comparisons found no significant difference between ELISAs 1 and 3, but ELISA 2 differed from both ELISA 1 and 3 (ROC Chi-square, p < 0.05). Based on these analyses, the overall diagnostic performance of the three OF ELISAs ranked ELISA 1 ≥ ELISA 3 > ELISA 2.
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Affiliation(s)
- Alexandra Henao-Diaz
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA.
| | - Luis Giménez-Lirola
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA
| | - Ronaldo Magtoto
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA
| | - Ju Ji
- Department of Statistics, College of Liberal Arts and Sciences, Iowa State University, Ames, IA 50011, USA
| | - Jeffrey Zimmerman
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA
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O'Connor M, Lasgaard M, Larsen L, Johannsen M, Lundorff M, Farver-Vestergaard I, Boelen PA. Comparison of proposed diagnostic criteria for pathological grief using a sample of elderly bereaved spouses in Denmark: Perspectives on future bereavement research. J Affect Disord 2019; 251:52-59. [PMID: 30903989 DOI: 10.1016/j.jad.2019.01.056] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 01/12/2019] [Accepted: 01/22/2019] [Indexed: 01/04/2023]
Abstract
BACKGROUND A distinct grief-specific disorder is included in the ICD-11. Lack of clarity remains regarding whether different proposed diagnostic criteria capture similar or different diagnostic entities. Our aim was to examine the specificity of four proposed diagnostic criteria-sets for pathological grief in a population-based sample. METHODS Participants were 206 conjugally bereaved elderly Danes (59% female; mean age = 72.5 years, SD = 4.2; range 65-81) who completed self-report questionnaires six months post-loss. The main measure was the Danish version of Inventory of Complicated Grief-Revised. RESULTS Results indicate substantial agreement between Prolonged Grief Disorder (PGD), Persistent Complex Bereavement Disorder (PCBD) and ICD-11-PGD (kappa's = 0.69-0.84), which found 6-9% of cases tested positive for pathological grief. Complicated Grief (CG) was partly in agreement with the three other symptom-diagnostic tests (kappa's = 0.13-0.20), and the prevalence-rate of pathological grief was 48%. LIMITATIONS The low response-rate of 39%. The selective inclusion of data ≥6 months post-loss prevents a comparison of acute and prolonged grief reactions. Using self-reported data, not diagnostic interviews, challenges the validity of our findings. Using a sample of elderly people may limit the generalizability of our results to other age groups. CONCLUSION We suggest that PGD, PCBD and ICD-11-PGD may be more discriminative in identifying a specific grief-related psychopathology, while CG may identify a broader set of grief reactions.
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Affiliation(s)
- Maja O'Connor
- Unit for Bereavement Research, Department of Psychology, Aarhus University, Aarhus, Denmark; The Danish National Center for Grief, Copenhagen, Denmark.
| | | | - Lene Larsen
- The Danish National Center for Grief, Copenhagen, Denmark
| | - Maja Johannsen
- Unit for Bereavement Research, Department of Psychology, Aarhus University, Aarhus, Denmark
| | - Marie Lundorff
- Unit for Bereavement Research, Department of Psychology, Aarhus University, Aarhus, Denmark
| | | | - Paul A Boelen
- Department of Clinical Psychology, Utrecht University, Utrecht, the Netherlands; Arq Psychotrauma Expert Group, Diemen, the Netherlands
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Otero-Abad B, Armua-Fernandez MT, Deplazes P, Torgerson PR, Hartnack S. Latent class models for Echinococcus multilocularis diagnosis in foxes in Switzerland in the absence of a gold standard. Parasit Vectors 2017; 10:612. [PMID: 29258612 PMCID: PMC5737983 DOI: 10.1186/s13071-017-2562-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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: 07/27/2017] [Accepted: 11/29/2017] [Indexed: 11/10/2022] Open
Abstract
Background In Europe the principal definitive host for Echinococcus multilocularis, causing alveolar echinococcosis in humans, is the red fox (Vulpes vulpes). Obtaining reliable estimates of the prevalence of E. multilocularis and relevant risk factors for infection in foxes can be difficult if diagnostic tests with unknown test accuracies are used. Latent-class analysis can be used to obtain estimates of diagnostic test sensitivities and specificities in the absence of a perfect gold standard. Samples from 300 foxes in Switzerland were assessed by four different diagnostic tests including necropsy followed by sedimentation and counting technique (SCT), an egg-PCR, a monoclonal and a polyclonal copro-antigen ELISA. Information on sex, age and presence of other cestode species was assessed as potential covariates in the Bayesian latent class models. Different Bayesian latent-class models were run, considering dichotomized test results and, additionally, continuous readings resulting in empirical ROC curves. Results The model without covariates estimated a true parasite prevalence of 59.5% (95% CI: 43.1–66.4%). SCT, assuming a specificity of 100%, performed best among the four tests with a sensitivity of 88.5% (95% CI: 82.7–93.4%). The egg-PCR showed a specificity of 93.4% (95% CI: 87.3–99.1%), although its sensitivity of 54.8% was found moderately low (95% CI: 48.5–61.0%). Relatively higher sensitivity (63.2%, 95% CI: 55.3–70.8%) and specificity (70.0%, 95% CI: 60.1–79.4%) were estimated for the monoclonal ELISA compared to the polyclonal ELISA with a sensitivity and specificity of 56.0% (95% CI: 48.0–63.9%) and 65.9% (95% CI: 55.8–75.6%), respectively. In the Bayesian models, adult foxes were found to be less likely infected than juveniles. Foxes with a concomitant cestode infection had double the odds of an E. multilocularis infection. ROC curves following a Bayesian approach enabled the empirical determination of the best cut-off point. While varying the cut-offs of both ELISAs, sensitivity and specificity of the egg-PCR and SCT remained constant in the Bayesian latent class models. Conclusions Adoption of a Bayesian latent class approach helps to overcome the absence of a perfectly accurate diagnostic test and gives a more reliable indication of the test performance and the impact of covariates on the prevalence adjusted for diagnostic uncertainty. Electronic supplementary material The online version of this article (10.1186/s13071-017-2562-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Belen Otero-Abad
- Section of Veterinary Epidemiology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Maria Teresa Armua-Fernandez
- Institute of Parasitology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.,Laboratorio de Vectores y Enfermedades transmitidas, Facultad de Veterinaria, CENUR Litoral Norte - Salto- Universidad de la República, Rivera 1350, 50000, Salto, Uruguay
| | - Peter Deplazes
- Institute of Parasitology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Paul R Torgerson
- Section of Veterinary Epidemiology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Sonja Hartnack
- Section of Veterinary Epidemiology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.
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Bortolotti F, Sorio D, Bertaso A, Tagliaro F. Analytical and diagnostic aspects of carbohydrate deficient transferrin (CDT): A critical review over years 2007-2017. J Pharm Biomed Anal 2017; 147:2-12. [PMID: 28912047 DOI: 10.1016/j.jpba.2017.09.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [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: 06/25/2017] [Revised: 08/30/2017] [Accepted: 09/01/2017] [Indexed: 02/07/2023]
Abstract
The need for investigating alcohol abuse by means of objective tools is worldwide accepted. Among the currently available biomarkers of chronic alcohol abuse, carbohydrate-deficient transferrin (CDT) is one of the most used indicator, mainly because of its high specificity. However, some CDT analytical and interpretation aspects are still under discussion, as witnessed by numerous research papers and reviews. The present article presents a critical review of the literature on CDT appeared in the period from 2007 to 2017 (included). The article is organized in the following sections: (1) introduction, (2) pre-analytical aspects (3) analytical aspects (4) diagnostic aspects (5) concluding remarks. As many as 139 papers appeared in the international literature and retrieved by the search engines PubMed, Web of Science and Scopus are quoted.
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Affiliation(s)
- F Bortolotti
- Dept of Diagnostics and Public Health, Unit of Forensic Medicine, University of Verona, Italy.
| | - D Sorio
- Dept of Diagnostics and Public Health, Unit of Forensic Medicine, University of Verona, Italy
| | - A Bertaso
- Dept of Diagnostics and Public Health, Unit of Forensic Medicine, University of Verona, Italy
| | - F Tagliaro
- Dept of Diagnostics and Public Health, Unit of Forensic Medicine, University of Verona, Italy; Institute of Pharmacy and Translational Medicine, Sechenov First Medical University, Moskow, Russia
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19
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Stewart LD, Tort N, Meakin P, Argudo JM, Nzuma R, Reid N, Delahay RJ, Ashford R, Montgomery WI, Grant IR. Development of a novel immunochromatographic lateral flow assay specific for Mycobacterium bovis cells and its application in combination with immunomagnetic separation to test badger faeces. BMC Vet Res 2017; 13:131. [PMID: 28499434 PMCID: PMC5427577 DOI: 10.1186/s12917-017-1048-x] [Citation(s) in RCA: 18] [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: 02/28/2017] [Accepted: 05/04/2017] [Indexed: 11/25/2022] Open
Abstract
Background The European badger is an important wildlife reservoir of Mycobacterium bovis implicated in the spread of bovine tuberculosis in the United Kingdom and Ireland. Infected badgers are known to shed M. bovis in their urine and faeces, which may contaminate the environment. To aid bovine tuberculosis control efforts novel diagnostic tests for detecting infected and shedding badgers are needed. We proposed development of a novel, rapid immunochromatographic lateral flow device (LFD) as a non-invasive test to detect M. bovis cells in badger faeces. Its application in combination with immunomagnetic separation (IMS) to detect Mycobacterium bovis cells in badger faeces is reported here. Results A novel prototype LFD for M. bovis cells was successfully developed, with unique specificity for M. bovis and a limit of detection 50% (LOD50%) of 1.7 × 104 M. bovis cells/ml. When IMS was employed to selectively capture and concentrate M. bovis cells from badger faeces prior to LFD testing, the LOD50% of the IMS-LFD assay was 2.8 × 105 M. bovis cells/ml faecal homogenate. Faeces samples collected from latrines at badger setts in a region of endemic bovine tuberculosis infection were tested; 78 (18%) of 441 samples tested IMS-LFD assay positive, whereas 140 (32%) tested IMS-qPCR positive (Kappa agreement −0.009 ± 0.044, p = 0.838). Subsequently, when 130 faeces samples from live captured, or captive, badgers of known infection status (on the basis of StatPak, interferon-γ and/or culture results) were tested, the IMS-LFD assay had higher relative diagnostic specificity (Sp 0.926), but poorer relative diagnostic sensitivity (Se 0.081), than IMS-qPCR (Sp 0.706, Se 0.581) and IMS-culture (Sp 0.794, Se 0.436). Conclusions The novel IMS-LFD assay, although very specific for M. bovis, has low analytical sensitivity (indicated by the LOD50%) and would only detect badgers shedding high numbers of M. bovis (>104–5 cells/g) in their faeces. The novel LFD would, therefore, have limited value as a non-invasive test for badger TB surveillance purposes but it may have value for alternative veterinary diagnostic applications.
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Affiliation(s)
- Linda D Stewart
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, Northern Ireland, UK
| | - Nuria Tort
- Forsite Diagnostics Limited (now Abingdon Health), National Innovation Campus, Sand Hutton, York, UK
| | - Paul Meakin
- Forsite Diagnostics Limited (now Abingdon Health), National Innovation Campus, Sand Hutton, York, UK
| | - Jose M Argudo
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, Northern Ireland, UK
| | - Ruramayi Nzuma
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, Northern Ireland, UK
| | - Neil Reid
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, Northern Ireland, UK.,Quercus, School of Biological Sciences, Belfast, Northern Ireland, UK
| | - Richard J Delahay
- National Wildlife Management Centre, Animal and Plant Health Agency, Woodchester Park, Nympsfield, Gloucestershire, UK
| | - Roland Ashford
- Animal and Plant Health Agency, Weybridge, New Haw, Addlestone, Surrey, UK
| | - W Ian Montgomery
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, Northern Ireland, UK.,Quercus, School of Biological Sciences, Belfast, Northern Ireland, UK
| | - Irene R Grant
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, Northern Ireland, UK.
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20
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Aalberse RC, Aalberse JA. Molecular Allergen-Specific IgE Assays as a Complement to Allergen Extract-Based Sensitization Assessment. J Allergy Clin Immunol Pract 2016; 3:863-9; quiz 870. [PMID: 26553613 DOI: 10.1016/j.jaip.2015.09.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 08/25/2015] [Accepted: 09/18/2015] [Indexed: 11/25/2022]
Abstract
Molecular allergen-based component-resolved diagnostic IgE antibody tests have emerged in the form of singleplex assays and multiplex arrays. They use both native and recombinant allergen molecules, sometimes in combination with each other, to supplement allergen extract-based IgE antibody analyses. The total number of available allergenic molecules has reached a diagnostically useful level; however, more molecules are needed to cover all the clinically important allergen specificities. Thus, for the foreseeable future, molecular allergen-specific IgE analyses will remain a supplement for initial allergen extract-based IgE antibody analyses in the diagnostic workup of the allergic patient. As a spin-off, it will enable manufacturers to improve the quality of extracts for in vitro testing. The 2 most exciting diagnostic developments linked to component-resolved diagnostic tests are the possibility to increase diagnostic sensitivity by the inclusion of allergens that are underrepresented in the current extracts and in vitro assays and to increase the diagnostic specificity by taking the information on allergen cross-reactivity into account. Particularly the latter application is still under development. This requires additional studies on the clinical relevance of serological cross-reactivity.
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Affiliation(s)
- Rob C Aalberse
- Sanquin Research, Department of Immunopathology, Amsterdam, The Netherlands; Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands.
| | - Joost A Aalberse
- Laboratory for Translational Immunology, Department of Pediatric Immunology, University Medical Center, Utrecht, The Netherlands
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Griffin TP, Casey R, Wall D, Bell M, O'Shea PM. Evaluating the optimum rest period prior to blood collection for fractionated plasma free metanephrines analysis. Pract Lab Med 2016; 5:39-46. [PMID: 28856203 DOI: 10.1016/j.plabm.2016.05.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 03/09/2016] [Revised: 05/05/2016] [Accepted: 05/06/2016] [Indexed: 12/25/2022] Open
Abstract
Introduction The high diagnostic accuracy of plasma metanephrines (PMets) in the diagnosis of Phaeochromocytoma/Paraganglioma (PPGL) is well established. Considerable controversy exists regarding optimum sampling conditions for PMets. The use of reference intervals that do not compromise diagnostic sensitivity is recommended. However, the optimum rest period prior to sampling has yet to be clearly established. The aim of this study was to evaluate PMets concentrations in paired blood samples collected following 30 and 40 min seated-rest prior to sampling, in patients in whom it was clinically reasonable to suspect that PPGL may be present. Design and Methods A retrospective cross-sectional study design was used. PMets results from paired blood samples collected after 30 and 40 min seated-rest between January 2009 and June 2015 were recorded. Results were interpreted using reference intervals established in subjects seated and supine. Results A total of 410 patient results were eligible for analysis. There was no statistical difference between plasma normetanephrine (NMN) or metanephrine (MN) concentrations in samples collected following 30 and 40 min seated-rest in subjects with PPGL (n=11), post-resection of PPGL (n=20) or in whom PPGL was excluded (n=379). Using reference intervals established in the seated position, diagnostic sensitivity was 100% at 30 min and 90.9% at 40 min. Diagnostic specificity was approximately 95% at both time points. When supine reference intervals were used, diagnostic sensitivity was 100% and diagnostic specificity was reduced by ≈22% at both time points. Conclusion Based on these data, we recommend at most 30 min continuous rest prior to sampling for PMets measurement.
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Abstract
The high soft tissue contrast of MR imaging enables superior tissue characterization of mediastinal masses, adding diagnostic specificity and often changing and benefiting clinical management. MR imaging can better discern cystic from solid content and can detect microscopic fat, hemorrhage, and fibrous content within lesions. In many cases, mediastinal MR imaging may prevent unnecessary diagnostic intervention. In other cases, MR imaging may indicate the optimal site for biopsy or the correct compartment for resection. Awareness of the efficacy of MR imaging with regard to mediastinal mass characterization and judicious MR imaging utilization should further improve patient care.
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Affiliation(s)
- Jeanne B Ackman
- Division of Thoracic Imaging and Intervention, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Founders 202, 55 Fruit Street, Boston, MA 02114, USA.
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Huang W, Wang G, Lin H, Zhuge J, Nolan SM, Vail E, Dimitrova N, Fallon JT. Assessing next-generation sequencing and 4 bioinformatics tools for detection of Enterovirus D68 and other respiratory viruses in clinical samples. Diagn Microbiol Infect Dis 2016; 85:26-9. [PMID: 26971640 DOI: 10.1016/j.diagmicrobio.2016.01.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 01/11/2016] [Accepted: 01/22/2016] [Indexed: 01/09/2023]
Abstract
We used 4 different bioinformatics algorithms to evaluate the application of a metagenomic shot-gun sequencing method in detection of Enterovirus D68 and other respiratory viruses in clinical specimens. Our data supported that next-generation sequencing, combined with improved bioinformatics tools, is practically feasible and useful for clinical diagnosis of viral infections.
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Jaramillo D, Dürr S, Hick P, Whittington R. Bayesian estimation of diagnostic sensitivity and specificity of a nervous necrosis virus antibody ELISA. Prev Vet Med 2015; 123:138-142. [PMID: 26702588 DOI: 10.1016/j.prevetmed.2015.11.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [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: 08/12/2015] [Revised: 11/23/2015] [Accepted: 11/30/2015] [Indexed: 10/22/2022]
Abstract
Diagnosis of nervous necrosis virus (NNV) infection in susceptible fish species is mostly performed post-mortem due to the neurotropism of the causative agent and the only validated diagnostic assays require samples from brain and retinal tissue. However, a non-lethal alternative to test for exposure of fish to NNV is needed. An indirect ELISA for the detection of anti-NNV antibodies in was recently developed and evaluated to detect responses in the sera from immunized fish. For this study, we assessed the accuracy of the assay at detecting specific antibodies from naturally exposed fish using field samples from populations with differing infection status. We applied a Bayesian model, using RTqPCR as a second test. Median estimates of the diagnostic sensitivity and specificity of the VNN ELISA were 81.8% and 86.7%, respectively. We concluded that the assay was fit for the purpose of identifying animals in naturally exposed populations. With further evaluation in larger populations the test might be used to inform implementation of control measures, and for estimating infection prevalence to facilitate risk analysis. To our knowledge this is the first report on the diagnostic accuracy of an antibody ELISA for an infectious disease in finfish.
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Affiliation(s)
- Diana Jaramillo
- Faculty of Veterinary Science, The University of Sydney, Camden, NSW, Australia()
| | - Salome Dürr
- Faculty of Veterinary Science, The University of Sydney, Camden, NSW, Australia()
| | - Paul Hick
- Faculty of Veterinary Science, The University of Sydney, Camden, NSW, Australia()
| | - Richard Whittington
- Faculty of Veterinary Science, The University of Sydney, Camden, NSW, Australia().
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Fouke SJ, Benzinger T, Gibson D, Ryken TC, Kalkanis SN, Olson JJ. The role of imaging in the management of adults with diffuse low grade glioma: A systematic review and evidence-based clinical practice guideline. J Neurooncol 2015; 125:457-79. [PMID: 26530262 DOI: 10.1007/s11060-015-1908-9] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [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: 04/16/2015] [Accepted: 08/29/2015] [Indexed: 01/24/2023]
Abstract
QUESTION What is the optimal imaging technique to be used in the diagnosis of a suspected low grade glioma, specifically: which anatomic imaging sequences are critical for most accurately identifying or diagnosing a low grade glioma (LGG) and do non-anatomic imaging methods and/or sequences add to the diagnostic specificity of suspected low grade gliomas? TARGET POPULATION These recommendations apply to adults with a newly diagnosed lesion with a suspected or histopathologically proven LGG. RECOMMENDATION LEVEL II In patients with a suspected brain tumor, the minimum magnetic resonance imaging (MRI) exam should be an anatomic exam with both T2 weighted and pre- and post-gadolinium contrast enhanced T1 weighted imaging. CRITICAL IMAGING FOR THE IDENTIFICATION AND DIAGNOSIS OF LOW GRADE GLIOMA: LEVEL II In patients with a suspected brain tumor, anatomic imaging sequences should include T1 and T2 weighted and Fluid Attenuation Inversion Recovery (FLAIR) MR sequences and will include T1 weighted imaging after the administration of gadolinium based contrast. Computed tomography (CT) can provide additional information regarding calcification or hemorrhage, which may narrow the differential diagnosis. At a minimum, these anatomic sequences can help identify a lesion as well as its location, and potential for surgical intervention. IMPROVEMENT OF DIAGNOSTIC SPECIFICITY WITH THE ADDITION OF NON-ANATOMIC (PHYSIOLOGIC AND ADVANCED IMAGING) TO ANATOMIC IMAGING: LEVEL II Class II evidence from multiple studies and a significant number of Class III series support the addition of diffusion and perfusion weighted MR imaging in the assessment of suspected LGGs, for the purposes of discriminating the potential for tumor subtypes and identification of suspicion of higher grade diagnoses. LEVEL III Multiple series offer Class III evidence to support the potential for magnetic resonance spectroscopy (MRS) and nuclear medicine methods including positron emission tomography and single-photon emission computed tomography imaging to offer additional diagnostic specificity although these are less well defined and their roles in clinical practice are still being defined. QUESTION Which imaging sequences or parameters best predict the biological behavior or prognosis for patients with LGG? TARGET POPULATION These recommendations apply to adults with a newly diagnosed lesion with a suspected or histopathologically proven LGG. RECOMMENDATION Anatomic and advanced imaging methods and prognostic stratification LEVEL III Multiple series suggest a role for anatomic and advanced sequences to suggest prognostic stratification among low grade gliomas. Perfusion weighted imaging, particularly when obtained as a part of diagnostic evaluation (as recommended above) can play a role in consideration of prognosis. Other imaging sequences remain investigational in terms of their role in consideration of tumor prognosis as there is insufficient evidence to support more formal recommendations as to their use at this time. QUESTION What is the optimal imaging technique to be used in the follow-up of a suspected (or biopsy proven) LGG? TARGET POPULATION This recommendation applies to adults with a newly diagnosed low grade glioma. RECOMMENDATIONS LEVEL II In patients with a diagnosis of LGG, anatomic imaging sequences should include T2/FLAIR MR sequences and T1 weighted imaging before and after the administration of gadolinium based contrast. Serial imaging should be performed to identify new areas of contrast enhancement or significant change in tumor size, which may signify transformation to a higher grade. LEVEL III Advanced imaging utility may depend on tumor subtype. Multicenter clinical trials with larger cohorts are needed. For astrocytic tumors, baseline and longitudinal elevations in tumor perfusion as assessed by dynamic susceptibility contrast perfusion MRI are associated with shorter time to tumor progression, but can be difficult to standardize in clinical practice. For oligodendrogliomas and mixed gliomas, MRS may be helpful for identification of progression.
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Affiliation(s)
- Sarah Jost Fouke
- Swedish Neuroscience Institute, 751 Northeast Blakely Drive, Suite 4020, Seattle, WA, USA.
| | | | - Daniel Gibson
- Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - Timothy C Ryken
- Department of Neurosurgery, Kansas University Medical Center, Kansas City, KS, USA
| | - Steven N Kalkanis
- Department of Neurosurgery, Henry Ford Health System, Detroit, MI, USA
| | - Jeffrey J Olson
- Department of Neurosurgery, Emory University School of Medicine, Atlanta, GA, USA
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26
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Dogra V, Verma S, Singh G, Wani AH, Chahota R, Dhar P, Verma L, Sharma M. Development of OMP based indirect ELISA to gauge the antibody titers in bovines against Pasteurella multocida. Iran J Vet Res 2015; 16:350-356. [PMID: 27175202 PMCID: PMC4782674] [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] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Revised: 06/27/2015] [Accepted: 08/09/2015] [Indexed: 06/05/2023]
Abstract
Pasteurella multocida (P. multocida) is an important pathogen of various domestic animals. The outer membrane proteins (OMPs) play a major role in pathogenesis and immunogenicity of P. multocida. The aim of the study was to develop indirect enzyme linked immuno sorbant assay (ELISA) based on OMPs to ascertain the antibody titers in animals post-infection or to gauge the potency of vaccine. The OMPs were extracted and purified from P. multocida P:52 (vaccine strain) and P. multocida B:2 isolated from natural outbreak of Haemorrhagic septicaemia (HS) and analyzed on SDS PAGE and through western blot. The OMPs profile of the vaccine strain and the isolate from the natural outbreak of HS were found to be similar. Optimization of various components viz. coating antigens, anti-species conjugate, etc. were carried out against both anti-P. multocida hyper immune and pre immune serum. Validation of OMP based indirect ELISA assay to measure immune response against P. multocida in bovine revealed 91% diagnostic sensitivity (DSN) and about 100% diagnostic specificity (DSP) at 25% cut off. OMP based indirect ELISA was found to be more specific, but less sensitive as compared to WCL based assay.
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Affiliation(s)
- V Dogra
- MVSc in Veterinary Microbiology, Department of Veterinary Microbiology, Dr. G. C. Negi College of Veterinary & Animal Sciences, CSK Himachal Pradesh Agricultural University, Palampur, Himachal Pradesh, 176062, India
| | - S Verma
- Department of Veterinary Microbiology, Dr. G. C. Negi College of Veterinary & Animal Sciences, CSK Himachal Pradesh Agricultural University, Palampur, Himachal Pradesh, 176062, India
| | - G Singh
- Department of Veterinary Physiology & Biochemistry, Dr. G. C. Negi College of Veterinary & Animal Sciences, CSK Himachal Pradesh Agricultural University, Palampur, Himachal Pradesh, 176062, India
| | - A. H Wani
- MVSc in Veterinary Microbiology, Department of Veterinary Microbiology, Dr. G. C. Negi College of Veterinary & Animal Sciences, CSK Himachal Pradesh Agricultural University, Palampur, Himachal Pradesh, 176062, India
| | - R Chahota
- Department of Veterinary Microbiology, Dr. G. C. Negi College of Veterinary & Animal Sciences, CSK Himachal Pradesh Agricultural University, Palampur, Himachal Pradesh, 176062, India
| | - P Dhar
- Department of Veterinary Microbiology, Dr. G. C. Negi College of Veterinary & Animal Sciences, CSK Himachal Pradesh Agricultural University, Palampur, Himachal Pradesh, 176062, India
| | - L Verma
- MVSc in Veterinary Microbiology, Department of Veterinary Microbiology, Dr. G. C. Negi College of Veterinary & Animal Sciences, CSK Himachal Pradesh Agricultural University, Palampur, Himachal Pradesh, 176062, India
| | - M Sharma
- Department of Veterinary Microbiology, Dr. G. C. Negi College of Veterinary & Animal Sciences, CSK Himachal Pradesh Agricultural University, Palampur, Himachal Pradesh, 176062, India
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Zhao ZH, Fan YC, Yang Y, Wang K. Association between Ras association domain family 1A promoter methylation and hepatocellular carcinoma: A meta-analysis. World J Gastroenterol 2013; 19:7189-7196. [PMID: 24222965 PMCID: PMC3819557 DOI: 10.3748/wjg.v19.i41.7189] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2013] [Revised: 08/15/2013] [Accepted: 08/20/2013] [Indexed: 02/06/2023] Open
Abstract
AIM: To assess diagnostic accuracy of Ras association domain family 1A (RASSF1A) promoter methylation in body fluids (serum, plasma and whole blood) for hepatocellular carcinoma (HCC).
METHODS: Relative information about study characteristics and incidence of RASSF1A methylation was collected. Quality of all included studies was evaluated by Quality Assessment of Diagnostic Accuracy Studies-2. Sensitivity and specificity were pooled using a random-effect model, and a summary receiver operating characteristic curve was used to demonstrate the overall diagnostic performance. Positive likelihood ratio (PLR), negative likelihood ratio (NLR), and diagnostic odds ratio (DOR) with 95%CI were also calculated. Meta-regression was applied to analyze observed heterogeneity, and Deeks’ test was performed to detect publication bias.
RESULTS: After a systematic literature review, seven studies with a total of 302 cases of HCC and 250 cases of chronic liver diseases were included in the analysis. The pooled sensitivity and specificity were 0.70 (95%CI: 0.49-0.85) and 0.72 (95%CI: 0.54-0.85), respectively. The PLR was 2.51 (95%CI: 1.64-3.86), NLR was 0.41 (95%CI: 0.25-0.68), and DOR was 6.13 (95%CI: 3.17-11.84). The χ2 values of sensitivity, specificity, PLR, NLR and DOR were 59.41 (P < 0.001), 50.50 (P < 0.001), 17.40 (P = 0.010), 31.24 (P < 0.001) and 80.51 (P < 0.001), respectively. The area under the curve was 0.77 (95%CI: 0.73-0.81). Three factors were analyzed by univariate meta-regression and none was significant to interpret the observed heterogeneity (P > 0.05). No significant publication bias was detected by Deeks’ test (P = 0.346).
CONCLUSION: We showed the potential diagnostic value of RASSF1A methylation in body fluids in HCC patients and it may improve diagnostic accuracy combined with the α-fetoprotein test.
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