OIE Standards on validation of diagnostic tests in general and for wildlife
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1 Dr François Diaz OIE Scientific Technical Department OIE Stards on validation of diagnostic tests in general for wildlife Regional Seminar for OIE National Focal Points for Wildlife Nakuru (Kenya), November 2016
2 OIE stards Terrestrial Animal Health Code mammals, birds bees Aquatic Animal Health Code fish, molluscs crustaceans Manual of Diagnostic Tests Vaccines for Terrestrial Animals Manual of Diagnostic Tests for Aquatic Animals Codes Manuals available on the OIE website World Organisation for Animal Health Protecting animals, Preserving our future 2
3 Chapters of the OIE Terrestrial Manual of the Aquatic Manual Identical chapter in both manuals because principles methods are same Title: Principles methods of validation of diagnostic assays for infectious diseases Included for the first time in the Terrestrial Manual in 2000 in the Aquatic Manual in 2003 World Organisation for Animal Health Protecting animals, Preserving our future 3
4 Other chapters of the OIE Terrestrial Manual the Aquatic Manual relevant for validation Eight (8) Chapters have been developed in complement of this stard: Chapter Chapter Chapter Chapter Chapter Chapter Chapter Chapter Development optimisation of antibody detection assay Development optimisation of antigen detection assay Development optimisation of nucleic acid detection assays Measurement uncertainty Statistical approaches to validation Selection use of reference samples panels Principles methods for the validation of diagnostic tests for infectious diseases applicable to wildlife Comparability of assays after minor changes in a validated test method NEW World Organisation for Animal Health Protecting animals, Preserving our future 4
5 Chapters of the OIE Terrestrial Manual of the Aquatic Manual relevant for validation chapters have been developed by OIE ad hoc Groups adopted by the World Assembly of Delegates (2013 for the chapter, 2014 for the first 7 guidelines, 2016 for the last one). Available downloadable on the OIE website World Organisation for Animal Health Protecting animals, Preserving our future 5
6 What is test validation? Process that determines the fitness of an assay for (an) intended purpose(s) for specific specimen(s) specie(s) Process that determines the assay s analytical diagnostic It is an ongoing process. World Organisation for Animal Health Protecting animals, Preserving our future 6
7 Why test validation? Confidence in test results obtained Ensure quality of the test results Repeatability in a same laboratory Reproducibility in other laboratories World Organisation for Animal Health Protecting animals, Preserving our future 7
8 OIE development validation pathway Preliminary considerations Assay Development Pathway Definition of the intended purpose of the assay Study design Design protocol Reagents controls Optimisation, Calibration to Stards Analytical specificity Analytical sensitivity STAGE 1 Analytical Repeatability preliminary Reproducibility Cidate test compared with stard test method Assay Validation Pathway Diagnostic specificity Diagnostic sensitivity Cut-off determination Select collaborating labs Define evaluation panel Reproducibility STAGE 2 Diagnostic STAGE 3 Reproducibility Samples from reference animals or experimental animals (where used) Provisional recognition Assay designated as validated for the original intended purpose(s) Interpretation of test results STAGE 4 Reference stards selected Deployment to other labs Implementation International recognition (OIE) Validation Status Retention Replacement of depleted reagents Assay-modifications re-validation Comparability assessments Monitoring maintenance of validation criteria Monitor precision accuracy Daily in-house QC Proficiency testing
9 Intended Purpose(s) for assay Essential Prerequisites Study Design Protocol Assay Validation Pathway
10 Intended Purpose(s) for assay Essential Prerequisites Study Design Protocol Analytical Specificity Analytical Sensitivity STAGE 1 Analytical Repeatability preliminary Reproducibility Assay Validation Pathway
11 STAGE 1: ANALYTICAL CHARACTERISTICS Analytical sensitivity: smallest detectable amount of analyte that can be measured with a defined certainty Analytical specificity: Degree to which the assay distinguishes between the target analyte other components in the sample matrix Repeatability: Level of agreement between replicates of a sample both within between runs of the same test method in a given laboratory World Organisation for Animal Health Protecting animals, Preserving our future 11
12 Intended Purpose(s) for assay Essential Prerequisites Study Design Protocol Analytical Specificity Analytical Sensitivity STAGE 1 Analytical Repeatability Assay Validation Pathway Diagnostic Specificity Diagnostic Sensitivity Cut-off Determination STAGE 22 Diagnostic Traditional approach assuming a perfect reference stard Latent class analysis to deal with imperfect reference stard
13 STAGE 2: DIAGNOSTIC CHARACTERISTICS Selection of reference animals Diagnostic specificity : Proportion of known uninfected reference animals that test negative in the assay Diagnostic sensitivity : Proportion of known infected reference animals that test positive in the assay Comparison with existing diagnostic test Final Threshold determination World Organisation for Animal Health Protecting animals, Preserving our future 13
14 Intended Purpose(s) for assay Essential Prerequisites Study Design Protocol Analytical Specificity Analytical Sensitivity STAGE 1 Analytical Repeatability Assay Validation Pathway Diagnostic Specificity Diagnostic Sensitivity Cut-off Determination STAGE 22 Diagnostic STAGE 3 Reproducibility
15 STAGE 3: REPRODUCIBILITY Definition: ability of a test method to provide consistent results when applied to aliquots of the same samples tested at different laboratories Provides additional data for the estimation of the repeatability Provides additional data on the robustness if the test method has been developed as a diagnostic kit. World Organisation for Animal Health Protecting animals, Preserving our future 15
16 Intended Purpose(s) for assay Essential Prerequisites Study Design Protocol Analytical Specificity Analytical Sensitivity STAGE 1 Analytical Repeatability Assay Validation Pathway Diagnostic Specificity Diagnostic Sensitivity Cut-off Determination STAGE 22 Diagnostic STAGE 3 Reproducibility Deployment to other Labs STAGE 4 Implementation
17 STAGE 4: PROGRAMME IMPLEMENTATION Extensive application of the test method in different laboratories, Interpretation of tests results, International recognition World Organisation for Animal Health Protecting animals, Preserving our future 17
18 Intended Purpose(s) for assay Essential Prerequisites Study Design Protocol Assay Validation Pathway Analytical Specificity Analytical Sensitivity Diagnostic Specificity Diagnostic Sensitivity Cut-off Determination STAGE 1 Analytical STAGE 22 Diagnostic Repeatability Adjunct tests validated Provisional recognition STAGE 3 Reproducibility Validated for original intended purpose(s) Deployment to other Labs STAGE 4 Implementation International recognition (OIE)
19 Intended Purpose(s) for assay Essential Prerequisites Study Design Protocol Analytical Specificity Analytical Sensitivity STAGE 1 Analytical Repeatability Assay Validation Pathway Diagnostic Specificity Diagnostic Sensitivity Cut-off Determination STAGE 22 Diagnostic STAGE 3 Reproducibility Deployment to other Labs STAGE 4 Implementation Daily in-house QC Monitoring maintenance of validation criteria Proficiency testing
20 Validation of diagnostic tests for wildlife diseases - Challenges Stage 2: difficulty in obtaining sufficient samples for estimation of DSe DSp Regulations limiting or prohibiting possession international shipment of samples Poor sample quality Experimental infections may be only source of reference samples Limited knowledge of pathogenesis/epidemiology of many diseases World Organisation for Animal Health Protecting animals, Preserving our future 20
21 Validation of diagnostic tests for wildlife diseases the proposed way forward Existence of a test validated in other related species for the disease of interest? Pathway 1 No Yes Pathway 2 Assay development + Assay validation Need to proceed to a verification of Stage 1 validation with the specific reagents that will be used Validation status of Stage 1 is satisfactory The verification shows the need to have a new validation of Stage 1 Stage 2a: minimal level to fulfil to consider a diagnostic test as provisionally recognised Stage 2a need to be fulfilled: Provisional recognition Stage 1 + Stage 2a need to be fulfilled: Provisional recognition World Organisation for Animal Health Protecting animals, Preserving our future 21
22 Validation of diagnostic tests for wildlife diseases the proposed way forward Stage 2a: minimal level to fulfil to consider a diagnostic test as provisionally recognised Stage 2a need to be fulfilled: Provisional recognition Stage 1 + Stage 2a need to be fulfilled: Provisional recognition Stage 2b Stage 3: OIE recognition fully validated Stage 4: Implementation World Organisation for Animal Health Protecting animals, Preserving our future 22
23 Validation of diagnostic tests for wildlife diseases the proposed way forward World Organisation for Animal Health Protecting animals, Preserving our future 23
24 Thank you for your attention Dr François Diaz 12, rue de Prony, Paris, France - oie@oie.int
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