quickvue covid test sensitivity and specificity

Federal government websites often end in .gov or .mil. m 2)g`[Hi i`2D@f8HL] k In people with confirmed COVID-19, antigen tests correctly identified COVID-19 infection in an average of 73% of people with symptoms, compared to 55% of people without symptoms. If sensitivity or specificity is not listed, it was not available from the manufacturer at the time of posting. Overall test sensitivity was 84.9% (95% CI 79.1-89.4) and specificity was 99.5% (95% CI 98.7-99.8). Please use the form below to provide feedback related to the content on this product. JAMA Netw Open 3:e2012005. The sensitivity (95% CI) for laboratory confirmed cases (repeat-tested patients) was 85.7% (81.5-89.1%) inpatients; 95.5% (92.2-97.5%) outpatients, 89.9% (88.2-92.1%) all. Clipboard, Search History, and several other advanced features are temporarily unavailable. rY,a K^`#G+s.#GO`?Ogggg[[[[[rbrbrbrb\2K9=(zPAe=(z0`lp6:glp6:gO,&n'[Jy;ybv}J* PLoS One 2020. Nasal swab is a good alternative sample for detecting SARS-CoV-2 with rapid antigen test: A meta-analysis. A positive test result for COVID-19 indicates that Cochrane Database Syst Rev. Test results and respective RT-PCR C T value for (A), MeSH Comparative evaluation of six nucleic acid amplification kits for SARS-CoV-2 RNA detection. dba MicroGen DX, Orig3n 2019 Novel Coronavirus (COVID-19) Test, UNC Health SARS-CoV-2 real-time RT-PCR test, University of North Carolina Medical Center, Infectious Disease Diagnostics Laboratory within the Department of Pathology and Laboratory Medicine at the Childrens Hospital of Philadelphia, Yale New Haven Hospital, Clinical Virology Laboratory, 96.1% (SARS-CoV-2), 95.5% (flu A), 91.7% (flu B), 100% (SARS-CoV-2), 99% (flu A), 96.8% (flu B), NAAT (reverse transcriptase isothermal amplification), Real time TMA, Dual Kinetic Assay (DKA), multiplex, 96.1% (SARS-CoV-2), 100% (flu A), 100% (flu B), 99.6% (SARS-CoV-2), 99.2% (flu A), 100% (flu B), molecular isothermal Reverse Transcriptase Helicase-Dependent Amplification (RT-HDA), isothermal amplification, Home collection, 96.2% (SARS-CoV-2), 100% (flu A), 98.3% (flu B), 100% (SARS-CoV-2), 98.9% (flu A), 100% (flu B), transcription-mediated nucleic acid amplification (TMA), Antigen Paramagnetic Microbead-based Immunoassay, non-isothermal nucleic acid amplification (qSTAR), Isothermal amplification (OMEGA), patented, 98.4% (symptomatic), 99.1% (asymptomatic), GetMyDNA COVID-19 Test Home Collection Kit, 95.2% (symptomatic), 95.4% (asymptomatic), 97.7% (symptomatic), 97.5% (asymptomatic), 96.4% (SARS-CoV-2), 100% (influenza A), 100% (influenza B), 98% (SARS-CoV-2), 99.6% (influenza A), 99.7% (influenza B), 100% (automated extraction), 96.7% (manual), 93.3% (automated extraction), 93% (manual), transcription mediated amplification (TMA), Cedars-Sinai Medical Center, Department of Pathology and Laboratory Medicine, Pathology/Laboratory Medicine Lab of Baptist Hospital, Miami, Florida. Test results were read after 15 min, and participants completed a questionnaire in the meantime. 0 doi: 10.1128/mBio.00902-21. A diagnostic accuracy study comparing RNA LAMP, direct LAMP, and rapid antigen testing from nasopharyngeal swabs. Clinical SARS-CoV-2 RT-PCR sensitivity estimates in the laboratory confirmed, and in the laboratory, MeSH See this image and copyright information in PMC. declared that COVID -19 was a pandemic on March 11, 2020, and . 2023 Feb 3;23(1):240. doi: 10.1186/s12889-023-15036-9. 2021. Index tests were treated as inconclusive, Sensitivity of RAD tests for C T value categories and cumulated C T, Individual test results. Specificity of available antibody tests may vary by assay; it is important to check the validation data provided by the manufacturer and/or performing laboratory. In children with symptoms, diagnostic sensitivity and specificity were 71.8% and 98.7%, respectively, and in those without symptoms, sensitivity and specificity were 56.2% and 98.6%, respectively. Of the 370 COVID-19 diagnostic tests that the US Food and Drug Administration has authorized for emergency use in the US, there are dozens you can take at home. The authors declare no conflict of interest. Now the probability that the Governor is infected is 9/58 = 15%, much lower than before. Public health officials are urging Americans to get tested before traveling or gathering with friends and family members, making rapid tests an important tool for curbing a variant that is. Initial versions were claimed to possess a sensitivity of around 80%, but more recent ones are claimed to have about 97% sensitivity, which is certainly comparable with PCR tests. And, to a mathematician, impressive as well as a bit intimidating. This test is authorized for use at the Point of Care (POC), i.e., in patient care settings operating under a CLIA Certificate of Waiver, Certificate of Compliance, or Certificate of Accreditation. Dive Brief: Quidel Corporation shared new data late Friday showing its COVID-19 antigen test has 96.7% sensitivity within five days of the onset of patient symptoms. Results: Sensitivity of the QuickVue was found to be 27% in this sample. YHUZeo{.ecYU`bG &%o/r4$.%2Kf1s|_K'{d]tptptpTZ%DM&t nB7M&t)s9E2GQ(s9sl`W_~UvV`Ae=(z0`lp6:glp6:g|_'>th1c1. Deckert A, Anders S, de Allegri M, Nguyen HT, Souares A, McMahon S, Boerner K, Meurer M, Herbst K, Sand M, Koeppel L, Siems T, Brugnara L, Brenner S, Burk R, Lou D, Kirrmaier D, Duan Y, Ovchinnikova S, Marx M, Krusslich HG, Knop M, Brnighausen T, Denkinger C. Trials. 3`EJ|_(>]3tzxyyy4[g `S~[R) IMPORTANCE Rapid antigen detection devices for SARS-CoV-2 represent a valuable tool for monitoring the spread of infection. With the underlying study, the head-to-head test performance and the usability of self-collected samples for SARS-CoV-2 detection using rapid antigen detection devices were evaluated. With others, you take a sample and mail it in for results. Additional Information - Quidel's EUA COVID-19 Products (Scroll down to the list of EUA products and enter Quidel in the search box). Meanwhile, clinical studies for Ellume COVID-19 home test showed 96% accuracy for those who had symptoms and 91% accuracy for people who did not have symptoms. Available from, Kucharski AJ, Klepac P, Conlan A, Kissler SM, Tang M, Fry H, et al.. Room temperature (15C to 30C/59F to 86F). We rapid-tested a sample onsite and compared results with those from reverse transcription PCR and virus culture. The QuickVue RSV Test is a dipstick immunoassay that detects respiratory syncytial virus (RSV) antigen (viral fusion protein) directly from nasopharyngeal swab, nasopharyngeal aspirate, or nasal/nasopharyngeal wash specimens for symptomatic pediatric patients (eighteen years of age and younger). The outpatient cohort of 1,814 individuals (mean [SD] age, 45.4 [17.2] years; 69.1% women) was sampled from epidemiological line lists by systematic quasi-random sampling. Some of these at-home tests require a prescription or telehealth monitoring. uyratmP >NhHl'SlYb@~G C,l.H8Xh/2 My|PP#ZQ ,eH/dx+ P/b::@\A &"`^X(DZDAX `CA[tv@sx$A1%S:;6k5S1=3,`gs4n;!%&e&ywaqR K |{Q~MRx/(f0 5HL Specificity is compounded It may be helpful to define some terms here. Beijing Wantai Biological Pharmacy Enterprise Co., Ltd. BioFire Respiratory Panel 2.1-EZ (RP2.1-EZ), BioGX SARS-CoV-2 Reagents for BD MAX System, ScienCell SARS-CoV-2 Coronavirus Real-time RT-PCR (RTqPCR) Detection Kit, Novel Coronavirus (SARS-CoV-2) Fast Nucleic Acid Detection Kit (PCR-Fluorescence Probing), COVID-19 RT-PCR Peptide Nucleic Acid (PNA) kit, FastPlex Triplex SARS-CoV-2 detection kit (RT-Digital PCR), Jiangsu Bioperfectus Technologies Co., Ltd, RTA Laboratories Biological Products Pharmaceutical and Machinery Industry, Gravity Diagnostics SARS-CoV-2 RT-PCR Assay, DiaPlexQ Novel Coronavirus (2019-nCoV) Detection Kit, QuantiVirus SARS-CoV-2 Multiplex Test Kit, Gnomegen COVID-19 RT-Digital PCR Detection Kit, Logix Smart Coronavirus Disease 2019 (COVID-19) Kit, New York SARS-CoV-2 Real-time Reverse Transcriptase (RT)-PCR Diagnostic Panel, Quest COVID-19 PCR Test Home Collection Kit, Amazon Real-Time RT-PCR Test for Detecting SARS-CoV-2, STS Lab Holdco (a subsidiary of Amazon.com Services LLC), Color SARS-CoV-2 RT-LAMP Diagnostic Assay, The Color COVID-19 Self-Swab Collection Kit, Color COVID-19 Self-Swab Collection Kit with Saline, Amazon Multi-Target SARS-CoV-2 Real-Time RT-PCR DTC Test, Amazon Real-Time RT-PCR DTC Test for Detecting SARS-CoV-2, Amazon Multi-Target SARS-CoV-2 Real-Time RT-PCR Test, STS Lab Holdco (a subsidiary of Amazon.com Services LLC, RCA Laboratory Services LLC dba GENETWORx, Laboratory Corporation of America (Labcorp), Life Sciences Testing Center COVID-19 Test, Yale School of Public Health, Department of Epidemiology of Microbial Diseases, Kwokman Diagnostics COVID-19 Home Collection Kit, The Mount Sinai Hospital, Center for Clinical Laboratories, binx health At-Home Nasal Swab COVID-19 Sample Collection Kit, Cleveland Clinic Robert J. Tomsich Pathology and Laboratory Medicine Institute, Everlywell COVID-19 & Flu Test Home Collection Kit, Harvard University Clinical Laboratory (HUCL), Pinpoint by Phosphorus COVID-19 Test Home Collection Kit DTC, Laboratory Corporation of America (LabCorp), Kaiser Permanente High Throughput SARS-CoV-2 Assay, Southern California Permanente Medical Group, Clinical Enterprise SARS-CoV-2 RT-PCR Assay, Clinical Enterprise SARS-CoV-2 RT-PCR Assay DTC, University of Illinois Office of the Vice President for Economic Development and Innovation, ResearchDx, Inc., DBA Pacific Diagnostics, Infinity BiologiX TaqPath SARS-CoV-2 Assay, Gravity Diagnostics SARS-CoV-2 RT-PCR for use with DTC kits, CRSP SARS-CoV-2 Real-time Reverse Transcriptase (RT)-PCR Diagnostic Assay, Clinical Research Sequencing Platform (CRSP), LLC at the Broad Institute of MIT and Harvard, Kroger Health COVID-19 Test Home Collection Kit, Everlywell COVID-19 Test Home Collection Kit DTC, Quest Diagnostics RC COVID-19 +Flu RT-PCR, Quest Diagnostics Infectious Disease, Inc, Stanford Health Care Clinical Virology Laboratory, UCLA SwabSeq COVID-19 Diagnostic Platform, University of California, Los Angeles (UCLA), Cuur Diagnostics SARS-CoV-2 Molecular Assay, Akron Childrens Hospital SARS-Cov-2 Assay, Acupath COVID-19 Real-Time (RT-PCR) Assay, Ethos Laboratories SARS-CoV-2 MALDI-TOF Assay, Texas Department of State Health Services (DSHS) SARS-CoV-2 Assay, Texas Department of State Health Services, Laboratory Services Section, Alpha Genomix TaqPath SARS-CoV-2 Combo Assay, George Washington University Public Health Laboratory, University of California San Diego Health, SNL-NM 2019 nCoV Real-Time RT-PCR Diagnostic Assay, Compass Laboratory Services SARS-CoV2 Assay, UCSF Health Clinical Laboratories, UCSF Clinical Labs at China Basin, Laboratorio Clinico Toledo SARS-CoV-2 Assay, LifeHope 2019-nCoV Real-Time RT-PCR Diagnostic Panel, Inform Diagnostics SARS-CoV-2 RT-PCR Assay, MD Anderson High-throughput SARS-CoV-2 RT-PCR Assay, University of Texas MD Anderson Cancer Center, Molecular Diagnostics Laboratory, HealthQuest Esoterics TaqPath SARS-CoV-2 Assay, The Ohio State University Wexner Medical Center, Omnipathology Solutions Medical Corporation, Express Gene 2019-nCoV RT-PCR Diagnostic Panel, Express Gene LLC, DBA: Express Gene Molecular Diagnostics Laboratory, Avera Institute for Human Genetics SARS-CoV-2 Assay, One Health Laboratories SARS-CoV-2 Real-Time RT-PCR Test, Columbia University Laboratory of Personalized Genomic Medicine, Biocollections Worldwide SARS-Co-V-2 Assay, Southwest Regional PCR Laboratory LLC. All contact information provided shall also be maintained in accordance with our endstream endobj startxref The QuickVue At-Home COVID-19 Test is a type of test called an antigen test. Cost: $23.99 for two tests. Easy to read and interpret. H\j >w%PrNReby6l*s)do@q;@. The terms sensitivity and specificity may not appear in the manufacturers information sheets, but are often reported as positive percent agreement and negative percent agreement. Sensitivity may also be measured by calculating the limit of detection, which is the lowest detectable number of virus copies in a sample at which the test will return a positive result at least 95% of the time. Dinnes J, Deeks JJ, Berhane S, Taylor M, Adriano A, Davenport C, Dittrich S, Emperador D, Takwoingi Y, Cunningham J, Beese S, Domen J, Dretzke J, Ferrante di Ruffano L, Harris IM, Price MJ, Taylor-Phillips S, Hooft L, Leeflang MM, McInnes MD, Spijker R, Van den Bruel A; Cochrane COVID-19 Diagnostic Test Accuracy Group. 6 The use of repeat RT-PCR testing as gold standard is likely to underestimate the true rate of false negatives, as not all patients in hbbd```b``"H&=^f`X"*e "V"CU H`KJ 2RSq)`7H{0i Often called "rapid tests" or "home COVID tests," these rapid antigen tests rely on a. Never miss a story with Governing's Daily newsletter. For the QuickVue rapid test the sensitivity was 8.5% (4.8-13.7%, 95% CI) and specificity was 99.2% (95.6-100%, 95% CI). endstream endobj 108 0 obj <. Rapid SARS-CoV-2 antigen detection assay in comparison with real-time RT-PCR assay for laboratory diagnosis of COVID-19 in Thailand. Finally, Quidel QuickVue touts an 83 . AN, anterior nasal;, Participant flowchart. Our aim was to determine the real-life clinical sensitivity of SARS-CoV-2 RT-PCR. ea|/0`N=CTN~FR_" E&+'y+!*Q"i%z-i@C; eD2 @xyywp1HZ@ 1e`qAF^OLFl,,gr58x=S3d#J)q@xgmLc h,r 8Ag`[X 'X H\n@b"20K DbRKXYp/J"^b?)]M>^}1]/c1u}1_kw0e>]tKZGx[xcz,ocPO:~ Conclusions: Sensitivity measures how often a test correctly generates a positive result for the condition being tested. Website Terms of Use Privacy Policy EEA Privacy Policy AdvaMed Code of Ethics Site Map, PPA (Reference Extracted SARS-CoV-2 RT-PCR Assay), NPA (Reference Extracted SARS-CoV-2 RT-PCR Assay), Product documentation is best viewed in Internet Explorer, General Information - Coronavirus (COVID-19), Additional Information - Quidel's EUA COVID-19 Products, Quick Reference Instructions - English - CE, Technical Bulletin - Antigen vs. Antibody Testing, Technical Bulletin - Detection of SARS-CoV-2 and SARS-CoV, Package Insert - CE -Latin American Spanish. In mid-June, Joanna Dreifus hit a pandemic . Where available, we list the manufacturer-reported sensitivity and specificity data. -, Moore NM, Li H, Schejbal D, Lindsley J, Hayden MK. Sensitivity Specificity COVID-19 At-Home Test SD Biosensor, Inc. lateral flow immunoassay ADVIA Centaur SARS-CoV-2 Antigen (CoV2Ag) Siemens Healthcare Diagnostics, Inc. . Quidel QuickVue At-Home COVID-19 Test. Because the sensitivity of the test is 97, of these about 48 will be labeled as positive, and the remaining 2 will not be correctly detected. Accuracy and cost description of rapid antigen test compared with reverse transcriptase-polymerase chain reaction for SARS-CoV-2 detection. about 48, will return positive. That also means that the remainder of the $N-P$ uninfected people, or $(1-b)(N-P)$, will test positive (these are the false positives). Bookshelf 263a, that meet the requirements to perform moderate, high or waived complexity tests. Clinical SARS-CoV-2 RT-PCR sensitivity estimates, Fig 3. Then of our 1000, 200 will be infected. The QuickVue SARS Antigen Test provides accurate and reliable results in 10 minutes. -, Fh B, Borsche M, Balck A, Taube S, Rupp J, Klein C, Katalinic A. Of these, the fraction who are infected, which we can interpret as the probability that a given person who tests positive is actually one of the infected is $$ { aP \over aP + (1 - b)(N-P) } $$, We can express this formula in terms of probabilities instead of population sizes. The https:// ensures that you are connecting to the Test parameters were calculated based on the evaluation of 87 participants. Included in the complete list are sensitivity and specificity measures, specimens required, target genes, and test details. Ready to use, no need for additional equipment. hbbd```b``kz 1755 0 obj <>/Filter/FlateDecode/ID[<1CD2A739A567014B97F17A74AD84D0B4><415B18644B42ED47B92E0A691BA431A3>]/Index[1735 38]/Info 1734 0 R/Length 103/Prev 631128/Root 1736 0 R/Size 1773/Type/XRef/W[1 3 1]>>stream Before "@$&/0yf}L2Q}@q "eLla Z|0 V Due to product restrictions, please Sign In to purchase or view availability for this product. Antigen tests are designed to detect proteins from the virus that causes COVID-19, in anterior nasal swabs. Selection of the outpatient cohort presented as a flowchart. Disclaimer. Indirect Virus Transmission via Fomites Can Counteract Lock-Down Effectiveness. %PDF-1.6 % Specificity is calculated based on how many people do not have the disease. In addition, there will be 800 who are not infected, and 5% or about 40 of these will test as positive, making a total of 220. doi: 10.1002/14651858.CD013705. J Mol Diagn. FOIA -, Altamirano J, Govindarajan P, Blomkalns AL, Kushner LE, Stevens BA, Pinsky BA, Maldonado Y. Bookshelf government site. Among 871 paired specimens from asymptomatic participants, 21 (2.4%) were antigen-positive and 17 (2.0%) were real-time RT-PCR-positive. Selection of the inpatient cohort presented as a flowchart. Dan Med J 68:A03210217. endstream endobj 195 0 obj <. Quidel Corporation Headquarters: The fastest test being used to diagnose people infected with the coronavirus appears to be the least accurate test now in common use, according to new research obtained by NPR. Sensitivity refers to the test's. The overall sensitivity of rapid antigen detection tests versus that of RT-PCR with oral, anterior nasal, and nasopharyngeal samples was 18.18% (95% confidence interval [CI] 8.19% to 32.71%), 63.04% (95% CI 47.55% to 76.79%), and 73.33% (95% CI 58.06% to 85.4%), respectively. The diagnostic testing field for COVID-19 is rapidly evolving, with many tests focused on diagnosing patients with active viral infections. If a diagnostic test correctly identified 100% of all positive results, it would be as sensitive as possible. 173 0 obj <>stream For diagnostic tests, it is the ability to identify those samples which are not infected with SARS-CoV-2. 2021. n?=0 !=GBGKdD&lchl(Ct)!$qV618rey\5x| Unable to load your collection due to an error, Unable to load your delegates due to an error. The QuickVue SARS Antigen Test provides accurate and reliable results in 10 minutes, allowing for COVID-19 testing of symptomatic patients within the first five days of symptoms and asymptomatic patients when tested serially. National Library of Medicine So in this case, when the proportion of the overall population who are infected is rather small, the test is swamped by false positives. 2020. RIDTs are not recommended for use in hospitalized patients with suspected . endstream endobj 1773 0 obj <>/Metadata 142 0 R/Outlines 202 0 R/Pages 1768 0 R/StructTreeRoot 258 0 R/Type/Catalog>> endobj 1774 0 obj <>/ExtGState<>/Font<>/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 1775 0 obj <>stream The PubMed wordmark and PubMed logo are registered trademarks of the U.S. Department of Health and Human Services (HHS). Nasopharyngeal swabs mark the gold standard for sample collection in suspected respiratory tract infections but are unsuitable for widespread application, as they must be performed by medically trained personnel. Careers. The ratio $q = (N-P)/N$ is the proportion of uninfected. See this image and copyright information in PMC. The FDA also authorized the Quidel QuickVue coronavirus test, which delivers results in 10 minutes and also can be used without a prescription. Wu S, Shi X, Chen Q, Jiang Y, Zuo L, Wang L, Jiang M, Lin Y, Fang S, Peng B, Wu W, Liu H, Zhang R, Kwan PSL, Hu Q. Ann Clin Microbiol Antimicrob. endstream endobj 1778 0 obj <>stream In addition to examining the first RT-PCR test of repeat-tested individuals, we also used high clinical suspicion for COVID-19 as the reference standard for calculating the sensitivity of SARS-CoV-2 RT-PCR. endstream endobj startxref J Clin Microbiol 2020. An official website of the United States government. A systematic review of the accuracy of covid-19 tests reported false negative rates of between 2% and 29% (equating to sensitivity of 71-98%), based on negative RT-PCR tests which were positive on repeat testing. Comparison of the performance of two real-time fluorescent quantitative PCR kits for the detection of SARS-CoV-2 nucleic acid: a study based on large real clinical samples. There will still be 950 who are not infected, but 5% = (100 - 95)% of these, i.e. The US FDA recommends that manufacturers use these terms to indicate that a nonreference standard was used when evaluating the test. The ratio $p = P/N$ is the proportion of infected in the general population. Brain Disord. ACS Infect Dis. Online ahead of print. ]bqi"w8=8YWf8}3aK txg^+v!a{Bhk 5YliFeT?}YV-xBmN(}H)&,# o0 10.1371/journal.pone.0242958 The QuickVue At-Home OTC COVID-19 Test is a lateral flow immunoassay, with results readable by eye. %PDF-1.5 % Somborac Baura A, Doroti M, Groi L, Dimbeg M, Dodig S. Biochem Med (Zagreb). The Pilot COVID-19 At-Home Test, distributed by Roche Diagnostics, is previously known as the COVID-19 At-Home Test. Lancet 2020. H\j@zY& s?}* it`Tn}M'w6pKMtxbrmLWs/4UuJwic|,omK'pk)R_Ktitk=>Fi6^X="5pSQbO%~!7 xKw~'g3#3#+'{dtptptp:\a W+ Rapid, point-of-care antigen and molecular-based tests for diagnosis of SARS-CoV-2 infection. 194 0 obj <> endobj The QuickVue SARS Antigen Test is authorized for use on anterior nares (NS) swab specimens directly from . Due to product restrictions, please Sign In to purchase or view availability for this product. This study is consistent with the low sensitivity of the QuickVue test also reported by others. The relatively high false negative rates of SARS-CoV-2 RT-PCR testing need to be accounted for in clinical decision making, epidemiological interpretations, and when using RT-PCR as a reference for other tests. Seiler LK, Stolpe S, Stanislawski N, Stahl F, Witt M, Jonczyk R, Heiden S, Blume H, Kowall B, Blume C. BMC Public Health. Then the ratio in the formula above is $$ { ap \over ap + (1-b)q } $$. Specificity is the ability of the test to identify those the true negatives. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. SARS-CoV-2 infection status was confirmed by RT-PCR. Cao G, Lin K, Ai J, Cai J, Zhang H, Yu Y, Liu Q, Zhang X, Zhang Y, Fu Z, Song J, Wang H, Yuan G, Wang S, Guan M, Zhang W. Front Microbiol. HHS Vulnerability Disclosure, Help The fast-spreading Omicron variant has made us increasingly reliant on at-home rapid antigen tests to tell us whether we have Covid-19. e.Republic LLC, Abbott BinaxNow COVID-19 Antigen Self Tests, California Residents - Do Not Sell My Personal Information. The x-axis corresponds to number of days after first reported symptoms, with 0 indicating 1 day before symptoms onset. Whats the difference between them? This page is updated twice weekly and includes only tests that have received EUA either from commercial manufacturers or laboratory-developed tests. Gupta-Wright A, Macleod CK, Barrett J, Filson SA, Corrah T, Parris V, Sandhu G, Harris M, Tennant R, Vaid N, Takata J, Duraisingham S, Gandy N, Chana H, Whittington A, McGregor A, Papineni P. BMJ Open.