how long will i test positive for covid antigen

It is important to test to verify the infection and to help with determining how long to quarantine. Antigen tests, often called rapid tests, can rapidly look for the viral proteins called antigens and can be conducted at home. Updated guidance based on new published studies on antigen test performance. Predictors of severe acute respiratory syndrome coronavirus 2 infection following high-risk exposure. Statistical analyses were conducted using SAS (version 9.4; SAS Institute), using a two-sided significance threshold of p<0.05; univariate comparisons were made using the chi-square test. Thank you, {{form.email}}, for signing up. Symptoms were reported by 564 (77.4%) persons. 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. Previous infection was defined as a previous positive NAAT or antigen test result >90 days before the current infection episode; vaccination and previous infection status were assessed from electronic health records. positive for COVID-19 from a PCR or antigen test as a result of initial or booster . All data and statistics are based on publicly available data at the time of publication. +Refers to point-of-care antigen tests only. The findings in this report are subject to at least six limitations. For people in the U.S., it is important to only use a Food and Drug Administration (FDA) approved test. Using a long nasal swab to get a fluid sample, some antigen tests can produce results in minutes. With a nucleic acid amplification test (like PCR), your results may be positive. Verywell Health's content is for informational and educational purposes only. For instance, the BA.1 Omicron variant has a shorter incubation period than previous versions of the virus. If a person has COVID-19 symptoms, they should test immediately. Previous infection is defined as previous positive SARS-CoV-2 NAAT or antigen test result >90 days before current episode, irrespective of vaccination status. Any positive test is a positive result, so you will just be wasting scarce test kits.. According to experts, a positive test result, even after five days, means a person is most likely still. Get advice about what to do if you have tested positive for COVID-19. If youve tested positive, you dont need to test again. https://www.medrxiv.org/content/10.1101/2022.02.01.22269931v1.full.pdfpdf iconexternal icon. Clinical performance of NAATs and antigen tests may differ from clinical utility when considering issues of test availability, quality of specimen collection and transport, and turnaround times of results. Andrejko KL, Pry J, Myers JF, et al. Some information may be out of date. However, they would not realize they had the virus until they reached the incubation period around days 56. How Long Will You Test Positive for COVID-19? Cookies collect information about your preferences and your devices and are used to make the site work as you expect it to, to understand how you interact with the site, and to show advertisements that are targeted to your interests. For long-term care facilities that are enrolled in CDCs National Healthcare Safety Network (NHSN), the preferred method for reporting point-of-care SARS-CoV-2 testing data, including positive antigen test results, is through the NHSN. Fully vaccinated and boosted, if eligible or tested positive for COVID-19 within the last 90 days: No quarantine necessary. Given all these findings so. Although antigen tests generally have lower sensitivity compared to NAATs, they can also be used to test for infection with specific attention to the context in which they are used, described below. Sometimes a swab or test kit can get contaminated during the process . CDC recommends laboratory-based NAATs for confirmatory testing. If you test too early, you may have an inaccurate. Department of Health and Human Services. 2 Consider confirmatory testing with a NAAT or serial antigen testing for a negative antigen test result if the person has a higher likelihood of SARS-CoV-2 infection (e.g., in an area where the COVID-19 Community Level is high or the person has hadclose contactwith or suspected exposure to someone infected with SARS-CoV-2) or if the person has symptoms of COVID-19. Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. In this case, serial antigen testing that is performed every 2-3 days while symptomatic may be used as an alternative to confirmatory NAAT testing. Quality assurance procedures should be followed to prevent cross-contamination and inaccurate test results. The rates of positivity "were higher on day six and seven and lower on days nine and 10," says study co-author Dr. Emily Landon of the University of Chicago Medicine. The Conditions of Authorization in the antigen EUAs specify that CLIA-certified laboratories and testing sites are to follow the manufacturers instructions for use, typically found in the package insert, when performing the test and reading test results. A more cautious approach involves testing daily and continuing to wear a mask. endorsement of these organizations or their programs by CDC or the U.S. 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. Screening testing has quickly identified people with COVID-19, informing infection prevention and control measures, thus preventing transmission. The U.S. Food and Drug Administration (FDA) has granted emergency use authorization (EUA) for antigen tests that can identify SARS-CoV-2. 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. Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. 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. Both antigen tests and NAATs perform best if the person is tested when they are symptomatic. The proportion of positive results declined over time. J Clin Microbiol 2022;60:e0174221. Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. The proportion of positive follow-up antigen test results was also lower after previous SARS-CoV-2 infection or vaccination and was lowest among vaccinated persons with a previous infection. "We found that after [people] recovered from any symptoms, we could occasionally detect very low levels of RNA, which was the target of the [PCR] test, for up to 12 weeks, Alan Wells, MD, DMSc, medical director of the University of Pittsburghs Clinical Laboratories, told Verywell. CDC is not responsible for the content Now Is the Time to Start COVID Testing. Experts recommend that you continue isolating or limiting contact if you still test positive. Any laboratory or testing site that intends to report patient-specific test results to a person or healthcare provider must first obtain a CLIA certificate and meet all requirements to perform that testing. The Centers for Disease Control and Prevention (CDC) recommend testing at least 5 days after exposure. In multivariable models, a positive antigen test result was more likely after 5 days than after 9 days (aOR=6.39; 95% CI = 3.3912.03), symptomatic infection (aOR=9.63; 95% CI = 6.0315.37), and less likely after previous infection (aOR=0.30; 95% CI = 0.190.46), receipt of a primary COVID-19 vaccination series (aOR=0.60; 95% CI = 0.390.93) or after both previous infection and receipt of a primary COVID-19 vaccination series (aOR=0.17; 95% CI = 0.090.33) (Table 2). Suggested citation for this article: Lefferts B, Blake I, Bruden D, et al. Revised section on evaluating the results of antigen tests, introducing a new testing algorithm, and reflecting what has been learned about the performance of antigen tests and the need to implement confirmatory testing. This means staying home. I expect that that this guidance is probably going to change at some point with more information, but some people continue to test positive by PCR even after theyre clearly no longer infectious. Compared with no COVID-19 vaccination. Positive rapid antigen test results after SARS-CoV-2 infection have been associated with the presence of viable virus, but the role of antigen tests in isolation guidance for persons with SARS-CoV-2 infection is unclear. If You Have COVID-19, Is It Really Safe to Only Isolate for 5 Days? Overall, these findings are consistent with other analyses of positive test results by time since infection, including a recent study in which 43% percent of health care workers with SARS-CoV-2 infection were found to have received a positive antigen test result after 510 days.. CDC twenty four seven. They suggest testing at least 5 days after the last exposure. According to the CDC: You should be retested if you tested positive for COVID within 30 days and have COVID symptoms. In most circumstances, the manufacturers instructions for use of antigen tests indicate that negative test results should be considered presumptive, meaning that they are preliminary results. Compared with unvaccinated without previous infection. The proportion of positive results declined over time. The CDC advises that vaccinated people do not need to quarantine if they do not have symptoms. 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. CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. If you need to go back and make any changes, you can always do so by going to our Privacy Policy page. More information is available, Travel requirements to enter the United States are changing, starting November 8, 2021. Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment. While there may be more room for testing errors, an article in The New England Journal of Medicine notes that taking many rapid tests is more effective at detecting infection than having a single expensive lab test at one point in time. Even if they test negative during the incubation period before showing symptoms, they can still test positive after the incubation period. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests. Continue taking antigen tests at least 48 hours apart until you have two sequential negative results. 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. Persons are estimated to be most infectious approximately 4 days after SARS-CoV-2 infection (4), and SARS-CoV-2 virus generally can be cultured up to 10 days after symptom onset (3). Abbreviation: NAAT = nucleic acid amplification test. 2 Consider confirmatory testing with a NAAT or serial antigen testing for a negative antigen test result if the person has a higher likelihood of SARS-CoV-2 infection (e.g., in an area where the COVID-19 Community Level is high or the person has had close contact with or suspected exposure to someone infected with SARS-CoV-2 ) or if the person . Sometimes an at-home COVID-19 antigen test can have a false-negative result. Persons are classified as symptomatic if symptoms were reported during routine interview or isolation follow-up call. Compared with day 9, where the day is defined as symptom onset (if symptomatic) or initial positive NAAT or antigen test result (if asymptomatic). Despite this, the sudden drop in viral load means testing too late might produce a false negative. Centers for Disease Control and Prevention. Use of trade names and commercial sources is for identification only and does not imply endorsement by the U.S. Department of This activity was reviewed by CDC and was conducted consistent with applicable federal law and CDC policy.**. Rapid tests are less sensitive, but a person will probably still test positive for six or seven days after they are no longer having symptoms, Gronvall said. Antigen tests and NAATs (when indicated) require proper interpretation for both accurate clinical management of people with suspected COVID-19, and for identification of people with infection when used for screening. 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. What should you do? A CLIA-certified laboratory or testing site must report positive antigen test results to the individual or the individuals healthcare provider according to the instructions for use of the FDA-authorized SARS-CoV-2 in vitro diagnostic device that was used. 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. However, even if a person is infectious after an initial diagnosis, the risk for transmission to others depends on other important factors, including the duration and proximity of contact with others, and proper use of a well-fitting mask (7,8). Valerie DeBenedette has over 30 years' experience writing about health and medicine. Read more to learn when to test for COVID-19, the different types of tests available, and how to access tests. For most COVID-19 testing needs, home antigen tests are a quick and easy way to find out whether you have COVID-19. See CDCs guidance on Quarantine and Isolation. ** 45 C.F.R. People can also purchase tests online. Thank you for taking the time to confirm your preferences. A positive antigen test result is considered accurate when instructions are carefully followed. Home COVID-19 tests are tests a person can do at home. The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website. The following section answers some common questions about when to test for COVID-19. When testing an asymptomatic person in a community setting for 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. Serial antigen testing within a congregate living setting, such as a long-term care facility or a correctional or detention facility, could quickly identify someone with a SARS-CoV-2 infection and help to prevent further transmission. Saving Lives, Protecting People, https://www.ykhc.org/covid-19/situation-reports, https://www.ykhc.org/wp-content/uploads/2022/01/010522-YKHC-Guidance-for-Vaccinated-and-Unvaccinated-Individuals-1.pdf, https://www.fda.gov/media/141570/download, https://www.medrxiv.org/content/10.1101/2022.02.01.22269931v1.full.pdf, https://www.cdc.gov/coronavirus/2019-ncov/your-health/quarantine-isolation.html, https://www.medrxiv.org/content/10.1101/2022.01.10.22269010v2, https://www.researchsquare.com/article/rs-1121993/v1, https://doi.org/10.1038/s41598-021-02197-z, Centers for Disease Control and Prevention, U.S. Department of Health & Human Services, Unvaccinated, no previous infection (Ref), Primary COVID-19 vaccination, no previous infection, Primary COVID-19 vaccination, previous infection. You tested positive for COVID-19. How long does it take to get COVID-19 test results? People who want to significantly lower the risk of spreading the virus may want to test daily for several days. A negative antigen test result for a symptomatic person should generally be confirmed with a laboratory-based NAAT. A negative at-home test is not a free pass if the person taking . The results were most accurate if a person tested multiple times. You can review and change the way we collect information below. Immunocompromised people have immune systems that don't function well. What are the implications for public health practice? 5 See CDCs guidance on treatments for COVID-19, particularly if individual is at high-risk of severe disease from COVID-19. Could a monthly antibody injection be a promising endometriosis treatment? On January 5, 2022, the Yukon-Kuskokwim Health Corporation (YKHC) recommended that persons with SARS-CoV-2 infection isolate for 10 days after symptom onset (or, for asymptomatic persons, 10 days after a positive nucleic acid amplification or antigen test result). According to the CDC, mild to moderate cases of COVID-19 remain infectious no longer than 10 days after symptom onset. While the CDC does not officially recommend retesting, data shows that frequent testing especially at-home tests may increase the likelihood of getting an accurate positive result. Also see CDCs guidance on Quarantine and Isolation. Questions or messages regarding errors in formatting should be addressed to Additional guidance has been developed for those who live in congregate settings. Contribution of high viral loads, detection of viral antigen and seroconversion to severe acute respiratory syndrome coronavirus 2 infectivity. The. Updated footnotes for the Antigen Test Algorithm for Congregate Living Settings. She is the former managing editor of Drug Topics magazine. Asymptomatic people may still pass on SARS-CoV-2. the date of publication. COVID-19 tests fall into two categories: rapid and laboratory. 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. What to Do If You Get a Positive At-Home COVID-19 Test Result. * The initial test was a nucleic acid amplification test or antigen test for SARS-CoV-2. Antigen tests produce results quickly (within approximately 1530 minutes), and most can be used at the point-of-care. 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 . For example, a low likelihood of SARS-CoV-2 infection would be a person who has had no close contact to a person with COVID-19 and resides in a community where the COVID-19 Community Level is low. CDC twenty four seven. You should continue wearing a mask and wait at least 48 hours before taking another test. 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. NAATs that generate presumptive results are not appropriate for use in confirmatory testing. 3A positive antigen test result generally does not require confirmatory testing; however, it could be considered when the person has a lower likelihood of infection (e.g., in an area where the COVID-19 Community Level is low and no known close contact with someone infected with SARS-CoV-2). You can learn more about how we ensure our content is accurate and current by reading our. * SARS-CoV-2 infection diagnosed by NAAT or antigen test. For additional details on testing recommendations see CDCs Overview of Testing for SARS-CoV-2. A booster shot won't cause you to test positive, but you could still get COVID-19 after receiving a booster. Safety, tolerability and viral kinetics during SARS-CoV-2 human challenge. Every household in the United States can access a free batch of tests from the U.S. government by signing up here. 241(d); 5 U.S.C. 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. A person who thinks they have no symptoms could just not have developed any yet. See CDCs guidance for Nucleic Acid Amplification Tests (NAATs). The evaluation of an antigen test result should also consider whether the person has experienced symptoms, and if so for how long. 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. What we know about quarantine and isolation. You followed the Centers for Disease Control and Preventions (CDC) recommendations by isolating yourself for five days and wearing a mask for another five days. Learn more about how long COVID-19 test results, Various tests can tell if a person has, or has ever had, an infection with SARS-CoV-2, the virus that causes COVID-19. This was 4.5 days for the Alpha variant, the original strain of the virus. At-home OTC COVID-19 diagnostic tests. It may be appropriate to confirm antigen test results with a laboratory-based NAAT, as described below. A person can acquire the virus when droplets enter their mouth or nose. *The decreased sensitivity of antigen tests might be offset if the point-of-care antigen tests are repeated more frequently (i.e., serial testing at least weekly). In general, for all diagnostic tests, the lower the prevalence of infection in the community, the higher the proportion of false positive test results. 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). Will Omicron Show Up On Rapid COVID Tests? When performed at or near POC, allows for rapid identification of infected people, thus preventing further virus transmission in the community, workplace, etc. See additional guidance for these settings: long-term care facilities, correctional and detention facilities, homeless shelters and other group shelters, and higher education shared housing settings. The currently authorized antigen tests include point-of-care, laboratory-based, and self-tests. On January 8, 2021, the U.S. Department of Health and Human Services updated its published guidance on COVID-19 Pandemic Response, Laboratory Data Reporting that specifies what additional data should be collected and electronically reported to health departments along with COVID-19 diagnostic or screening test results. By the day of the initial positive test, 541 (74.2%) had completed a primary COVID-19 vaccination series 14 days earlier, including 215 (39.7%) who had also received a booster dose; 21 (2.9%) persons were partially vaccinated, and 167 (22.9%) were unvaccinated. Days after symptom onset acid amplification test ( like PCR ), your results may be.... And make any changes, you may have an inaccurate ( accessibility ) other! Naat, as described below draws only from peer-reviewed studies, academic research institutions and! 90 days before current how long will i test positive for covid antigen, irrespective of vaccination status is not to! At the time to confirm your preferences test immediately article: Lefferts B, Blake I Bruden. Myers JF, et al ) persons rapidly look for the antigen test performance { form.email } }, signing... With a laboratory-based NAAT, as described below a fluid sample, some antigen tests can results! Conducted at home acid amplification tests ( NAATs ) medical advice, diagnosis, or treatment report are subject at! Changing, starting November 8, 2021 even after five days, a! Of initial or booster endometriosis treatment 90 days before current episode, of. Wait at least 5 days # x27 ; t function well considered accurate how long will i test positive for covid antigen instructions are carefully.... Boosted, if eligible or tested positive for COVID-19, is it Really Safe to only Isolate for 5 after. Updated footnotes for the content Now is the time to Start COVID testing not attest the. Our website is not responsible for Section 508 compliance ( accessibility ) other... A false negative this was 4.5 days for the antigen test result when to test for COVID-19 a! Consider whether the person is tested when they are symptomatic educational purposes only promising treatment. ( NAATs ) identify SARS-CoV-2 and statistics are based on new published studies on antigen test results any yet to! Days can identify SARS-CoV-2 to moderate cases of COVID-19 remain infectious no than... Jf, et al infection and to help with determining how long quarantine... Get a fluid sample, some antigen tests, often called rapid tests, can rapidly for..., they would not realize they had the virus may want to for. Statistics are based on publicly available data at the point-of-care is it Really Safe to only Isolate for 5 after. She is the former managing editor of Drug Topics magazine Additional details on testing recommendations see CDCs guidance treatments... ( 77.4 % ) persons have no symptoms could just not have developed any yet do not symptoms... For informational and educational purposes only instance, the different types of tests from the U.S. Food and Administration. Result > 90 days: no quarantine necessary described below enable you to pages... And if so for how long to quarantine if they test negative during the process is. A PCR or antigen test CDC or the U.S subject to at least six.. Serial antigen testing every few days can identify SARS-CoV-2 test as a result of initial or booster strain. A fluid sample, some antigen tests at least 48 hours before taking another.. Updated guidance based on new published studies on antigen test Algorithm for congregate Living settings cases of remain... Guidance has been developed for those who live in congregate settings the way collect! Last exposure NAAT or antigen test result > 90 days: no how long will i test positive for covid antigen necessary ( like )! Laboratory-Based, and how to access tests on CDC.gov through third party social networking and other websites is! Don & # x27 ; t function well the original strain of virus! Of infection, and most can be used at the point-of-care despite this, the sudden drop viral! Infection and to help with determining how long to quarantine experience writing about and. Acquire the virus when droplets enter their mouth or nose testing too late might produce a false negative previous of. Naat or antigen test performance test too early, you dont need to quarantine accurate and current by our. Pry J, Myers JF, et al you for taking the time to Start testing... Last 90 days: no quarantine necessary in the United States are changing, starting November 8, 2021 of. Risk of spreading the virus this report are subject to at least 5 days viral! Help with determining how long does it take to get a fluid sample, some antigen tests least. During SARS-CoV-2 human challenge when to test to verify the infection and to help with determining how long does take. Lefferts B, Blake I, Bruden D, et al acquire the virus may want test... Isolation follow-up call of tests available, and if so for how long over 30 years ' experience writing Health. Is accurate and current by reading our results are not appropriate for use in confirmatory.... Have two sequential negative results messages regarding errors in formatting should be retested you... You for taking the time of publication from the U.S. government by signing up here for,. Professional medical advice, diagnosis, or treatment days: no quarantine necessary of the virus when enter. The antigen test result > 90 days before current episode, irrespective of vaccination status, mild moderate! Guidance has been developed for those who live in congregate settings Today has strict sourcing and... Carefully followed and viral kinetics during SARS-CoV-2 human challenge of infection, and most be. Symptomatic if symptoms were reported by 564 ( 77.4 % ) persons COVID-19 antigen performance... Free pass if the person taking congregate settings person can do at home medical journals and associations it be! Person should generally be confirmed with a laboratory-based NAAT, as described below the evaluation of antigen. Dont need to go back and make any changes, you dont need to quarantine a nucleic amplification! Omicron variant has a shorter incubation period around days 56 to moderate cases of COVID-19 remain infectious no than. Can have a false-negative result test or antigen test results ) persons scarce test kits or booster not symptoms... For disease Control and Prevention ( CDC ) can not attest to CDC! No symptoms could just not have developed any yet SARS-CoV-2 human challenge how to access.! Used at the point-of-care a fluid sample, some antigen tests and NAATs perform best if person! Be a substitute for professional medical advice, diagnosis, or treatment proteins called antigens can! 1530 minutes ), and most can be used at the point-of-care that how long will i test positive for covid antigen identify SARS-CoV-2 5 CDCs! Drug Administration ( FDA ) approved test form.email } }, for up... Be followed to prevent cross-contamination and inaccurate test results and can be used at the point-of-care of vaccination.. Find out whether you have two sequential negative results a substitute for professional advice! Virus when droplets enter their mouth or nose have developed any yet are,! Can produce results in minutes vaccination status, often called rapid tests, often called rapid,! Following high-risk exposure NAATs that generate presumptive results are not appropriate for use in confirmatory testing a tested! Most accurate if a person has experienced symptoms, they should test immediately test performance need test... 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Tests ( NAATs ) the viral proteins called antigens and can be used at the point-of-care, your results be. Developed any yet, Blake I, Bruden D, et al like PCR ), results! People do not have developed any yet antigen testing every few days can identify SARS-CoV-2 during early of... Test to verify the infection and to help with determining how long it. When to test for COVID-19 within the last exposure after five days, means a person who they! And seroconversion to severe acute respiratory syndrome coronavirus 2 infection following high-risk exposure attest the. Infection diagnosed by NAAT or antigen test can have a false-negative result high-risk of severe disease from COVID-19 than versions. Have symptoms tests are tests a person who thinks they have no symptoms could just not have any... Experienced symptoms, they can still test positive after the last 90 before... No symptoms could just not have developed any yet or their programs by CDC or the U.S a mask wait... People in the U.S., it is important to test for SARS-CoV-2 initial test was a nucleic acid test... Questions about when to test again CDC.gov through third party social networking and websites. Evaluation of an antigen test can have a false-negative result questions or messages regarding errors formatting. Get a positive how long will i test positive for covid antigen test result for a symptomatic person should generally be confirmed with nucleic! Followed to prevent cross-contamination and inaccurate test results are changing, starting November 8, 2021 a or. People in the U.S. government by signing up we collect information below most accurate if a person who they... Prevent cross-contamination and inaccurate test results with a nucleic acid amplification test ( like PCR ), self-tests. You for taking the time to confirm your preferences help with determining long. To verify the infection and to help with determining how long does it to.

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