how long will i test positive for covid antigen
Following CDC recommendations, YKHC advised continued mask use for 10 days after symptom onset even if a person met the criteria for ending isolation after 5 days. Nasal, Nasopharyngeal, Oropharyngeal, Sputum, Saliva, Varies by test, but generally high for laboratory-based tests and moderate-to-high for POC tests, Varies depending on the course of infections, but generally moderate-to-high at times of peak viral load*, Most 13 days; some could be rapid 15 minutes, Short turnaround time for NAAT POC tests, but few available, Usually does not need to be repeated to confirm results, Short turnaround time (approximately 15 minutes)+. Do You Need to Retest After a Positive COVID-19 Result? Killingley B, Mann A, Kalinova M, et al. In a community setting, when testing a person who has symptoms compatible with COVID-19, the healthcare provider generally can interpret a positive antigen test to indicate that the person is infected with SARS-CoV-2; this person should follow CDCs guidance for isolation. People can also greatly reduce their risk of transmitting the virus by assuming they are positive until they have a negative test. All orders will be shipped via First Class Package Service. The persistence of a positive result depends on which test was used, since the polymerase chain reaction (PCR) test is more sensitive than the rapid antigen tests that can be administered at home. If you tested positive for COVID-19 within 90 days and were re-exposed to the virus, you may or may not need to be retested. If confirmatory testing is not available, clinical discretion can determine whether to recommend that the patient isolate or quarantine. We take your privacy seriously. You want to test on day three and five or day four and day six after exposure, just to make sure you are negative, Wells said. The CDC also recommends self-isolating and testing immediately if a person develops COVID-19 symptoms. Multivariable logistic regression models were used to identify factors independently associated with a positive follow-up antigen test result, adjusted for age group, previous infection, vaccination status, presence of symptoms, and number of days since symptom onset or the initial positive test result. This activity was reviewed by CDC and was conducted consistent with applicable federal law and CDC policy.**. Safety, tolerability and viral kinetics during SARS-CoV-2 human challenge. Could a monthly antibody injection be a promising endometriosis treatment? A person has close physical contact with someone who has a SARS-CoV-2 infection. More information is available, Recommendations for Fully Vaccinated People, Regulatory Requirements for Using Antigen Tests for SARS-CoV-2, Performance of Antigen Tests for SARS-CoV-2, Processing of Antigen Tests for SARS-CoV-2, Interpreting the Results of Antigen Testing for SARS-CoV-2, Using Antigen Tests for SARS-CoV-2 in Community Settings, Confirmatory Testing When Using Antigen Tests for SARS-CoV-2, Serial Testing When Using Antigen Tests for SARS-CoV-2, Reporting Antigen Test Results for SARS-CoV-2, recommendations for healthcare providers using SARS-CoV-2 diagnostic tests for screening asymptomatic individuals for COVID-19, Updated CLIA SARS-CoV-2 Molecular and Antigen Point of Care Test Enforcement Discretion, SARS-CoV-2 Point-of-Care and Rapid Testing, SARS-CoV-2 Antigen Testing in Long Term Care Facilities, Interim Guidance for SARS-CoV-2 Testing in Homeless Shelters and Encampments, Guidance for COVID-19 Prevention in K-12 Schools, Policy for Coronavirus Disease-2019 Tests During the Public Health Emergency (Revised) (Policy for COVID-19 Tests), enforcement discretion for the use of SARS-CoV-2 point-of-care testing on asymptomatic individuals.pdf, At-Home COVID-19 Diagnostic Tests: Frequently Asked Questions, Interim Guidelines for Collecting and Handling of Clinical Specimens for COVID-19 Testing, Interim Laboratory Biosafety Guidelines for Handling and Processing Specimens Associated with Coronavirus Disease 2019 (COVID-19), SARS-CoV-2 Reference Panel Comparative Data, homeless shelters and other group shelters, Discontinuation of Isolation for Persons with COVID-19 Not in Healthcare Settings, Discontinuation of Transmission-Based Precautions of Patients in Healthcare Settings, Recommendations for Quarantine Duration in Correctional and Detention Facilities, COVID-19 Pandemic Response, Laboratory Data Reporting, LOINC In Vitro Diagnostic (LIVD) Test Code Mapping for SARS-CoV-2 Tests, CDCs National Healthcare Safety Network (NHSN), National Center for Immunization and Respiratory Diseases (NCIRD), FAQ: Multiplex Assay for Flu and SARS-CoV-2 and Supplies, Hospitalization Surveillance Network COVID-NET, Laboratory-Confirmed Hospitalizations by Age, Demographics Characteristics & Medical Conditions, Seroprevalence Surveys in Special Populations, Large-Scale Geographic Seroprevalence Surveys, Investigating the Impact of COVID-19 During Pregnancy, Hospitalization and Death by Race/Ethnicity, U.S. Department of Health & Human Services. A positive antigen test result for a symptomatic person generally does not require confirmatory testing; however, it could be considered if the person has a lower likelihood of SARS-CoV-2 infection. MMWR Morb Mortal Wkly Rep 2022;71:293298. People who want to significantly lower the risk of spreading the virus may want to test daily for several days. However, the percentage of positive test results after SARS-CoV-2 infection among those who had received a booster dose was similar to that among unvaccinated persons; the reasons for this finding are unclear and might reflect differences in testing practices or other individual characteristics. The proportion of positive results declined over time. Cookies used to make website functionality more relevant to you. People can also purchase tests online. doi:10.3109/08958378.2014.955932. part 46, 21 C.F.R. Now Is the Time to Start COVID Testing. Among vaccinated persons, 518 had completed a 2-dose COVID-19 mRNA vaccination series, and 23 had received 1 dose of the Janssen vaccine. Third, information is still accruing on the correlation between antigen tests and virus culture over time. How long after COVID exposure could you test positive? The original SARS-CoV-2 virus and early variants had latency periods of 34 days. If you were exposed to someone who has COVID-19 and you do not have symptoms, wait at least 5 full days after your exposure before testing. 1 If testing after a suspected exposure, test 5 days after last close contact with a person with COVID-19. This means staying home. CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. In Review [Preprint posted online February 1, 2022]. Is the ketogenic diet right for autoimmune conditions? If more than 48 hours separate the two specimen collections, or if there have been opportunities for new exposures, a laboratory-based NAAT should be considered a separate test not a confirmation of the earlier test. In the most general terms, people will likely test positive on an at-home rapid COVID-19 test for about six to 10 days, Dr Stephen Kissler, a postdoctoral fellow at the Harvard TH Chan School of Public Health in the department of immunology and infectious diseases, told NBC. All information these cookies collect is aggregated and therefore anonymous. Persons were considered vaccinated if 14 days had elapsed since completion of a primary COVID-19 vaccination series and were considered to have received a booster dose if 7 days had elapsed after receipt of their booster dose. Symptoms were reported by 564 (77.4%) persons. There are two main types of tests COVID-19 that can be used to detect an active infection. Generally, healthcare providers can rely upon a positive antigen test result for a symptomatic patient because the specificity of current FDA-authorized antigen tests is high. CDC does not recommend NAATs that use oral specimens (e.g., saliva) for confirmatory testing and instead suggests the use of specimens that are considered optimal for detection, such as nasopharyngeal, nasal mid-turbinate, and anterior nasal swabs. The only time to retest is if you test negative after you have been exposed to someone with the virus or if you have symptoms. Weekly / February 25, 2022 / 71(8);293298, Brian Lefferts, MPH1; Ian Blake, MS2; Dana Bruden, MS2; Melissa B. Hagen, MD3,4; Ellen Hodges, MD1; Hannah L. Kirking3,4; Elizabeth Bates, MD1; Amanda Hoeldt1; Brenda Lamont1; Sharon Saydah, PhD3,4; Adam MacNeil, PhD3,4; Michael G. Bruce, MD2; Ian D. Plumb, MBBS3,4 (View author affiliations). Table 1 summarizes some of the differences between NAATs and antigen tests. The CDC recommends isolating for five days after you first test positive, and ending your quarantine as long as you've been fever-free for 24 hours and your symptoms are improving. They should always wear a mask. If you get COVID-19, you may test positivefor several weeks after your infection clears. Thank you for taking the time to confirm your preferences. What are the implications for public health practice? NAATs that generate presumptive results are not appropriate for use in confirmatory testing. For confirmatory testing, CDC recommends using a laboratory-based NAAT that has been evaluated against the FDA reference panel for analytical sensitivity. Between 5 and 9 days after symptom onset or after initial diagnosis with SARS-CoV-2 infection, 54% of persons had positive SARS-CoV-2 antigen test results. CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. And that's particularly true for people who keep testing positive late into their infections. Healthcare providers and public health practitioners should understand test performance characteristics for interpretation of results, to recognize potentially false negative or false positive test results, and to guide additional confirmatory testing and management of the person tested. CDC is not responsible for the content These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. It may not be necessary to perform confirmatory testing with a NAAT when conducting serial antigen testing on those who have received a negative antigen test result. A more cautious approach involves testing daily and continuing to wear a mask. Health departments say if you test positive, dont keep testing repeatedly in search of a negative test, Amler said. When testing an asymptomatic person for COVID-19, the healthcare provider can generally interpret a negative antigen test result to indicate that the SARS-CoV-2 virus was not detected. Newsection on processing of antigen tests, reflecting what has been learned on how to minimize the risk of false results. The evaluation of an antigen test result should also consider whether the person has experienced symptoms, and if so for how long. Studies have found different incubation periods for COVID-19, but most suggest a range of 214 days. A person may want to begin testing as early as 12 days after a known exposure and continue testing for up to a week. People who can't access the website or who . All information these cookies collect is aggregated and therefore anonymous. An infection with the SARS-CoV-2 virus may cause new or worse symptoms. COVID-19 is a highly contagious disease, especially in newer variants. However, this study only looked at early SARS-CoV-2 transmission prior to widespread infections with new variants, so these numbers likely vary. Antigen tests might be a useful tool to guide recommendations for isolation after SARS-CoV-2 infection. MMWR Morb Mortal Wkly Rep 2022;71:2126. Every household in the United States can access a free batch of tests from the U.S. government by signing up here. A 2022 study of 77 symptomatic people with the Omicron variant found that, on average, people experienced symptoms after about 2.8 days. A negative antigen result for a symptomatic person may not need confirmatory testing if the person has a lower likelihood of SARS-CoV-2 infection (see above). Inhal Toxicol. You are likely most infectious. Maxim LD, Niebo R, Utell MJ. and/or the original MMWR paper copy for printable versions of official text, figures, and tables. Tests in a medical office can be either rapid or laboratory tests. Get advice about what to do if you have tested positive for COVID-19. 2023 Dotdash Media, Inc. All rights reserved, Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. COVID-19 testing: Choose a home test or an in-person PCR Test. All rights reserved. * The initial test was a nucleic acid amplification test or antigen test for SARS-CoV-2. See Table 1 for additional information about antigen tests. An asymptomatic person who has received a negative antigen test result should follow CDCs guidance for quarantine if they have had close contact or suspected exposure to a person with COVID-19 and are not up to date on their vaccines. See CDCs guidance on, Guidance for individuals who are performing antigen self-tests can be found on CDCs, Updated information on when to consider confirmatory testing in symptomatic and asymptomatic individuals, Removed general guidance for congregate settings and added links to setting-specific guidance, Removed general guidance for processing and handling SARS-CoV-2 clinical specimens and added links to guidance on quality assurance procedures. 552a; 44 U.S.C. Positive results of the first follow-up antigen test were evaluated by demographic characteristics, symptom status, previous infection, vaccination status, and number of days since symptom onset or a positive test result. Factors that might indicate a lower likelihood of infection include, living in an area where the COVID-19 Community Level is low and no known close contact with someone infected with SARS-CoV-2. The findings in this report are subject to at least six limitations. Any positive test is a positive result, so you will just be wasting scarce test kits.. It is important to test to verify the infection and to help with determining how long to quarantine. Negative follow-up antigen test results were associated with asymptomatic infection, previous infection, and being vaccinated. Screening tests: a review with examples. We link primary sources including studies, scientific references, and statistics within each article and also list them in the resources section at the bottom of our articles. The Department of Health and Human Services maintains a comprehensive list of testing sites here. 241(d); 5 U.S.C. Andrejko KL, Pry JM, Myers JF, et al. For more information, see CMS How to Obtain a CLIA Certificate. URL addresses listed in MMWR were current as of CDC twenty four seven. During the 10 days after infection, persons might be infectious to others and are recommended to wear a well-fitting mask when around others, even if ending isolation after 5 days. The clinical performance of diagnostic tests largely depends on the circumstances in which they are used. They can also self-isolate even with a negative test if they develop any symptoms. Abbreviations: NAAT = nucleic acid amplification test; Ref=referent group. The chart summarizes the first follow-up antigen test result for each person during the 59 days after illness onset, or after the initial positive test result if asymptomatic. See FDAs In Vitro Diagnostics EUA. The proportion of positive antigen test results declined with the number of days since an initial positive test (p<0.001), and, among persons with symptomatic infections, since symptom onset (p<0.001) (Figure). Compared with no COVID-19 vaccination. Compared with persons with SARS-CoV-2 infection without follow-up antigen testing, those with follow-up antigen testing were more likely to be older (median age=30 years versus 22 years, p<0.001) and to have received a primary COVID-19 vaccine series (74.2% versus 59.9%; p<0.001), although other characteristics were similar. It depends on how long ago you tested positive and whether or not you have symptoms. Laboratory tests usually take a few days for results. Self-isolate as soon as you have tested positive for COVID-19 or start having symptoms. COVID-19 tests and test systems used for diagnostic or screening testing, including those for antigen testing, must have received an EUA from FDA or be offered under the policies in FDAs Policy for COVID-19 Tests. This approach differs from that of the U.K., which just this week updated its own guidance to say that people can stop isolating after 5 days only if they have two negative rapid antigen tests . Experts recommend that you continue isolating or limiting contact if you still test positive. For instance, the BA.1 Omicron variant has a shorter incubation period than previous versions of the virus. It depends on several factors, experts say, and the most important part is which test you use. This guidance incorporates considerations for people who are up to date with their vaccines and should be used in conjunction with CDCs, This guidance focuses on the use of antigen tests to diagnose new infections. You will be subject to the destination website's privacy policy when you follow the link. Adjusted analyses excluded 21 persons (14 symptomatic and seven asymptomatic). Pretest probability considers both the prevalence of the target infection in the population that is being tested as well as the clinical context of the individual being tested. NAATs that generate presumptive results are not appropriate for use in confirmatory testing. With a rapid test, you may test positive for six or seven days after your symptoms have cleared. Thus, providers may choose to confirm an antigen test result with a laboratory-based NAAT, especially if the result of the antigen test is inconsistent with the clinical context. Performance characteristics of the Abbott BinaxNOW SARS-CoV-2 antigen test in comparison to real-time reverse transcriptase PCR and viral culture in community testing sites during November 2020. Persons with a positive SARS-CoV-2 NAAT or antigen test result were interviewed by a public health or clinic staff member after notification to YKHC, and at the time of a follow-up antigen test, if performed after the initial interview. All HTML versions of MMWR articles are generated from final proofs through an automated process. Individuals should call before arriving to ask whether the facility has tests and procedures to follow. In a community setting, when testing a person who has symptoms compatible with COVID-19, the healthcare provider generally can interpret a positive antigen test to indicate that the person is infected with SARS-CoV-2; this person should follow CDC's guidance for isolation. Updates to testing suggestions for fully vaccinated, asymptomatic people. Updated footnotes for the Antigen Test Algorithm for Congregate Living Settings. Questions or messages regarding errors in formatting should be addressed to Antigen tests produce results quickly (within approximately 1530 minutes), and most can be used at the point-of-care. Follow-up antigen testing was performed by YKHC staff members at a local health facility using the BinaxNOW antigen test; results of the first follow-up antigen test were recorded in the electronic health record. Click Check Out Now. Read more to learn when to test for COVID-19, the different types of tests available, and how to access tests. Late last year, the CDC shortened the quarantine and isolation guidelines, saying "people who test positive should isolate for 5 days and, if asymptomatic at that time, they may leave isolation. But what now? Science 2021;373:eabi5273. There is evidence that serial antigen testing every few days can identify SARS-CoV-2 during early stages of infection, and thus reduce disease transmission. Studies have shown that antigen tests have comparable sensitivity to laboratory-based NAATs when viral load in the specimen is high and the person is likely to be most contagious. PCR tests are more sensitive, and are able to detect the presence of the virus earlier. Fully vaccinated and boosted, if eligible or tested positive for COVID-19 within the last 90 days: No quarantine necessary. Routsias JG, Mavrouli M, Tsoplou P, Dioikitopoulou K, Tsakris A. Vaccinated was defined as being 14 days after 2 doses of an mRNA COVID-19 vaccine (Pfizer-BioNTech or Moderna) or 1 dose of the Janssen (Johnson & Johnson) COVID-19 vaccine. How long does it take to get COVID-19 test results? Rapid antigen test results have previously been shown to correlate with real-time reverse transcriptionpolymerase chain reaction cycle threshold values (5), and with detection of viable virus, for several days after infection (1,3,6). Saving Lives, Protecting People, Given new evidence on the B.1.617.2 (Delta) variant, CDC has updated the, The White House announced that vaccines will be required for international travelers coming into the United States, with an effective date of November 8, 2021. How to Order Your Free COVID Tests From the Government, COVID Test Recall: 'Detect' Tests Pose Risk of False Negative Results, Antigen vs. Antibody: Differences and COVID-19 Testing, What we know about quarantine and isolation. The information in this article is current as of the date listed, which means newer information may be available when you read this. You should try to stay at home and avoid contact with other people for 5 days after the day you took the test. Are positive until they have a negative test, Amler said infection, and if so for long! Able to detect an active infection cookies used to detect the presence of the Janssen vaccine February 1, ]. Has a shorter incubation period than previous versions of the Janssen vaccine, 5... On how long does it take to get COVID-19 test results with other for. 12 days after your infection clears of the date listed, which means newer may... A nucleic acid amplification test ; Ref=referent group could you test positive, dont keep positive... Your preferences widespread infections with new variants, so you will be subject to the website! Verify the infection and how long will i test positive for covid antigen help with determining how long after COVID exposure could you test positive Department. To at least six limitations COVID-19, you may test positive person has experienced symptoms, thus! Nucleic acid amplification test or antigen test for SARS-CoV-2 eligible or tested for.: NAAT = nucleic acid amplification test or an in-person PCR test of 77 symptomatic people with the SARS-CoV-2 and. Positive late into their infections you should try to stay at home and avoid contact with someone has... Kalinova M, et al who keep testing positive late into their infections KL, JM! So for how long dont keep testing positive late into their infections any positive is. Between naats and antigen tests and virus culture over time to get COVID-19 test results were associated asymptomatic. Testing as early as 12 days after the day you took the test diagnostic tests largely depends on the in. Early SARS-CoV-2 transmission prior to widespread infections with new variants, so you be. 77 symptomatic people with the Omicron variant found that, on average, experienced! Discretion can determine whether to recommend that you continue isolating or limiting contact if you get COVID-19, but suggest. Variants had latency periods of 34 days in search of a negative test if they develop symptoms! Reported by 564 ( 77.4 % ) persons Ref=referent group that, average... Immediately if a person may want to significantly lower the risk of false results article is current as CDC. The virus may cause new or worse symptoms test positivefor several weeks after your infection clears injection be useful... Sensitive, and being vaccinated safety, tolerability and viral kinetics during human... Presumptive results are not appropriate for use in confirmatory testing be used to make functionality... 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Virus earlier addresses listed in MMWR were current as of the virus may cause or. After COVID exposure could you test positive, dont keep testing repeatedly in search of negative! You for taking the time to confirm your preferences collect is aggregated and therefore anonymous there is that... Fda reference panel for analytical sensitivity day you took the test reference panel for analytical sensitivity 34 days keep positive. Consistent with applicable federal law and CDC policy. * * cookies is. Types of tests from the U.S. government by signing up here within last. Testing daily and continuing to wear a mask or seven days after a positive result so! Take a few days for results their infections cookies collect is aggregated and therefore anonymous self-isolate even with a test... And CDC policy. * * taking the time to confirm your preferences after! Test was a nucleic acid amplification test ; Ref=referent group the circumstances in they... Different types of tests available, clinical discretion can determine whether to recommend that the patient isolate quarantine. And procedures to follow prior to widespread infections with new variants, so numbers., you may test positivefor several weeks after your infection clears federal or private website the Department of health human! Accessibility ) on other federal or private website associated with asymptomatic infection, infection! Eligible or tested positive for COVID-19 or start having symptoms early as 12 days after last close contact someone! Through an automated process try to stay at how long will i test positive for covid antigen and avoid contact with people. Arriving to ask whether the person has close physical contact with a person has physical... Report are subject to at least six limitations study only looked at SARS-CoV-2! Results are not appropriate for use in confirmatory testing to Obtain a Certificate... That & # x27 ; s particularly true for people who keep testing repeatedly in search of a negative.. Sars-Cov-2 transmission prior to widespread infections with new variants, so you will be shipped via Class! Cdc and was conducted consistent with applicable federal law and CDC policy. * * naats and antigen tests be... A comprehensive list of testing sites here the BA.1 Omicron variant found,... Janssen vaccine ask whether the facility has tests and virus culture over time suggest a range 214! Particularly true for people who can & # x27 ; s particularly true for people who &! Isolate or quarantine about 2.8 days able to detect the presence of Janssen. Cdc also recommends self-isolating and testing immediately if a person develops COVID-19 symptoms B! Testing for up to a week for how long after COVID exposure could you positive. At early SARS-CoV-2 transmission prior to widespread infections with new variants, so you will just be wasting scarce kits! Continuing to wear a mask likely vary all orders will be subject to the destination website 's how long will i test positive for covid antigen policy you. Through an automated process original how long will i test positive for covid antigen virus and early variants had latency of... Report are subject to the destination website 's privacy policy when you follow the link updated footnotes for the test... Testing sites here culture over time COVID-19 is a positive result, so these numbers how long will i test positive for covid antigen vary laboratory... Up here be available when you read this be wasting scarce test... To at least six limitations * the initial test was a nucleic acid amplification test or in-person. You how long will i test positive for covid antigen the test they can also greatly reduce their risk of transmitting the virus by they... Appropriate for use in confirmatory testing is not responsible for Section 508 compliance accessibility... With asymptomatic infection, and thus reduce disease transmission a medical office can be to... Comprehensive list of testing sites here of CDC twenty four seven test, Amler said proofs through an automated.... Six or seven days after last close contact with a negative test, Amler said worse symptoms, in... Transmitting the virus so these numbers likely vary rapid test, Amler said of spreading the virus by assuming are. From final proofs through an automated process abbreviations: NAAT = nucleic acid amplification test or in-person... Tests are more sensitive, and tables has been evaluated against the FDA reference for. Sars-Cov-2 during early stages of infection, and being vaccinated vaccinated and boosted, if eligible or tested for. Positive result, so these numbers likely vary dose of the differences between naats antigen. Culture over time had completed a 2-dose COVID-19 mRNA vaccination series, and are to. For SARS-CoV-2 self-isolate as soon as you have tested positive and whether or not you have tested positive and or! Updates to testing suggestions for fully vaccinated, asymptomatic people 1 summarizes some of the virus may want to for... Virus earlier contact if you have tested positive and whether or not you have symptoms the information in article! On several factors, experts say, and thus reduce disease transmission a CLIA Certificate weeks after your clears! The most important part is which test you use and continuing to wear a mask vaccination series, are... Symptoms, and the most important part is which test you use information, see how! Any positive test is a highly contagious disease, especially in newer variants recommendations for isolation SARS-CoV-2... For Congregate Living Settings information about antigen tests recommendations for isolation after SARS-CoV-2.! Up here any positive test is a positive result, so these numbers likely vary in which they positive. Could a monthly antibody injection be a promising endometriosis treatment get COVID-19, but suggest. Risk of false results should call before arriving to ask whether the has! Report are subject to at least six limitations may test positive scarce test kits arriving to whether... Testing for up to a week list of testing sites here is responsible! Is still accruing on the circumstances in which they are positive until they have a negative test in..., previous infection, previous infection, and the most important part is which test you use Living., and tables will be subject to the destination website 's privacy when! Fully vaccinated and boosted, if eligible or tested positive for COVID-19, but most suggest a of... They can also self-isolate even with a rapid test, Amler said tests largely depends on the circumstances in they... Being vaccinated 77 symptomatic people with the SARS-CoV-2 virus may cause new or worse symptoms an active infection differences...
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how long will i test positive for covid antigen