Recently, a weak positive case of COVID-19 was reported in the Northern Territory. Was I actually positive for COVID-19 or just tricking myself? Goodbye, brain scrapers. Still, whether the line or lines are bright or faint, two lines still mean positive, one line still means negative, and the safety precautions remain the same: "Five days of [isolation] and then five days of masking if you have no symptoms," before going back to your normal routine, Vail said. If the PCR test is negative, you're probably OK.". What should you do? But even though the darkness of a positive line on a COVID test is a correlation of how much virus is in the body, it still isn't a perfect measure to tell a person how infectious or sick they might be. Viral tests are used to gauge whether you have a current infection. You can think of a test strip as a venus fly trap, and the virus particles as the flies, Dr. Chin-Hong said. "The recommendations for serial testing are for people that have been exposed and are trying to diagnose themselves," says Karan. Write an article and join a growing community of more than 160,300 academics and researchers from 4,571 institutions. How accurate are rapid antigen tests for diagnosing COVID-19? Covid-19 testing facility overseer Dr Sally Shaw told 3AW a faint line should be considered a positive result on a RAT if the person has symptoms. Photo by Getty. We also may change the frequency you receive our emails from us in order to keep you up to date and give you the best relevant information possible. "But if it gets to its peak darkness after 20 seconds, then that means you have a tremendous amount of virus.". Are you positive or not? ", But even with a faint line on a positive test, Mina added: "Do not go visit Grandma.". When you visit the site, Dotdash Meredith and its partners may store or retrieve information on your browser, mostly in the form of cookies. Bobbi Brown Shares Her Top Face-Transforming Makeup Tips for Women Over 50. "However, if the faint line appears after the 30-minute interpretation window, it means it is not a positive . Its one of the reasons the publicly reported case numbers for COVID-19 are sometimes revised downwards, as weak positives are later confirmed to be negative after retesting. (Mucus, like saliva, can be thicker or thinner depending on how hydrated you are, she said. A doctor has explained why seeing a faint second 'positive' line on a lateral flow test doesn't always mean you have the virus. If your line is lighter, for instance, that doesn't mean you can ignore other precautions, like masking. Sometimes an at-home COVID-19 antigen test can have a false-negative result. Its not always as simple as positive or negative. , about the at-home antigen test for the virus that causes COVID-19 and how it determines whether the virus is inside the body and, if so, how much virus is there. Health.com recently interviewedEric Vail, MD,director of Molecular Pathology, about the at-home antigen test for the virus that causes COVID-19 and how it determines whether the virus is inside the body and, if so, how much virus is there. Each week, Chronicle health reporters field questions about the latest on COVID-19, vaccines and pandemic living. Thomas Russo, M.D., a professor and the chief of infectious diseases at the University at Buffalo in New York, agrees. "Say you're at home and your line is getting fainter and fainter and fainter. At-home COVID-19 tests provide a relatively simple and accessible way to see if you've become sick with the virus. The at-home tests can reveal if you are carrying Covid within . But going through the testing and results on your own can be a bit confusing, especially with so many factors at play. "For a virus to gather enough molecules on these tests to actually be able to show a line means there is a really large amount of virus there," he said. The virus levels in their body are gone or are so low that, after masking for an additional five days, they should be in the clear. Any information we might glean otherwisehow infectious or symptomatic we think we are or might beis just a guess. For the most recent updates on COVID-19, visit ourcoronavirus news page. If the line that indicates a positive shows up, it's becoming more likely that it will be thin, hard to make out and take a long time to . Epidemiologist, WHO Collaborating Centre for Reference and Research on Influenza, Epidemiologist, WHO Collaborating Centre for Viral Hepatitis, The Peter Doherty Institute for Infection and Immunity. This summer, after more than two years of evading COVID-19, I tested positive on a home rapid test.. He said: "If the faint line appears after the window, the . I was 10dpo. Read more: However, at-home tests have a ton of variables. Viral dynamics of Omicron and Delta SARS-CoV-2 variants with implications for timing of release from isolation: A longitudinal cohort study. Dr Sally Shaw, who oversees a Covid-19 testing site, told 3AW radio a faint second line should be considered as positive result if the person has symptoms. Julie Garcia is a features reporter at the Houston Chronicle focusing on health, fitness and outdoors. Long COVID. And what if the test turns positive but only after an hour? Don't read the test too early or too late, the experts said, because that may give you a false-negative or false-positive result. 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. Information on testing, vaccines, and help finding appointments near you. You should also take a test if you're exposed to someone who has COVID-19, the CDC says. 0 steph m (40) 07/12/2014 at 10:16 am Can anyone help???????? After following those guidelines from the U.S. Centers for Disease Control and Prevention (CDC), theres still the possibility that someone could test positive. You no longer have to get a follow-up PCR test if you test positive on a lateral flow with no symptoms . We don't know," Dr. Vail said. How to decide when to end your COVID isolation. If the result is negative and your symptoms continue, you should still take precautions, wear a mask and avoid close contact with. If you are positive you can expect to see two lines on the test, while a negative result will see just one line appearing within half an hour. A lateral flow test result is interpreted by the two letters on the device where the swap sample is dripped on to. It's especially important to test before gathering indoors with people who are at a higher risk for severe COVID-19 symptoms, such as older adults, people who are immunocompromised and children who are too young to be vaccinated, the CDC says. Also, keep an eye on the expiration date on the rapid tests you're using. COVID-19 tests now use gentler nose swabs, Worried you might test positive and put a spanner in Victoria's COVID roadmap? The darker the line, the more infectious you are, and the more important it is to wear a mask and avoid others. Mina emphasized a slow-appearing faint test can still represent high levels of virus. Any test that counts antibodies is looking at affinity, Neuman said. Does this mean I could have COVID-19? There is "some room for error" with those rapid tests, Karan says. Get in touch with Ruby at ruby.gregory@reachplc.com, For more of the latest news from across the capital, head to our homepage, Last month the Omicron variant overtook the Delta variant, and became the most dominant strain in the country. ANSWER: If you have symptoms of COVID-19, take an at-home antigen test and it is positive, you likely have COVID-19 and should isolate at home according to CDC guidelines. Some people however are still confused because if a line appears before or after the usual 30-minute waiting time, what does this mean? The line was barely there. If that positive line shows up, it's very likely that you have coronavirus proteins in your nose and that you have COVID-19. With different variants, theres a wider range of antibodies to offer protection, she said. Both rapid and PCR tests have the potential to be wrong. A molecular PCR test looks for genetic material and is considered to be the most accurate test to diagnose an active COVID infection, Chan said. If you suspect that you may have COVID but haven't tested positive yet, the FDA now recommends serial testing, which means you should repeat your home test after 48 hours to make sure you. You may not have swabbed your nose vigorously enough, Dr. Schaffner says. If you have been exposed to a person with COVID, the right time to be tested is within three to five days. False negative test result: unaware of their infection and could infect others. Tries 'New Approach' With Omicron Boosters. If your lighting is sub-par, he recommends using the flashlight feature on your phone to be sure youre viewing your results properly. You dont want to miss a faint line and you dont want to ostrich and pretend its not there, he says. COVID-19 tests, whether a rapid antigen test or a PCR test sent to a lab, do tend to be accurate on the positive side (if the test says you have COVID, you most. If your line is really light, especially on the back end of the infection, you could infect your spouse, who you're sleeping head to head with on a pillowbut you're probably not going to walk into a room and mistakenly infect 30 people.. What Line Intensity Might Say About a Person's COVID Infection. But there is a test hierarchy. Potentially, we do need a panel of tests that are looking at how antibodies bind to different spikes since spikes differ from variant to variant.. Or you're just getting back from your summer vacation and the back of your throat has a worrisome itch. London-based A&E doctor Nathan Hudson-Peacock has explained why timing is everything when it comes to using an LFT to detect COVID-19. Maybe you're one of millions of Americans who have started mingling with peers in the dorms and suddenly find yourself sniffling and wondering if you have COVID-19. Here's what it means if your at-home COVID-19 test result is extra faint or dark. The line may have been caused by very weak contaminants, such as food or drinks, rather than coronavirus, the doctor, said. As a result, youre probably less infectious in that moment. Theres really no actionable information to be gained (from looking at whether your line is lighter or darker), Volk explained. Join the London Coronavirus Updates group here. When a second line appears next to the 'T', this indicates a positive Covid reading. After 15 minutes it looked like the test was negative. "The faintness or darkness of the line probably has some correlation to degree of infectiousness especially early on [during the infection]," says Karan. "The tests aren't really meant to be read an hour later," says Malani. But, according to CDC guidance, that additional positive test gets you five more days of isolation. Doctors generally agree that this means you have COVID-19. What's the deal? The only situation in which you wouldn't assume that a faint line on a rapid test is positive is if it turned positive after the allotted testing period, Garner said. Try to take the test as close to the start time of the event as you can in order to get the most accurate results possible, the CDC advises. Alternatively, the sample could be referred to a reference laboratory to verify the result using specialised tests. By clicking Accept all you agree that Yahoo and our partners will process your personal information, and use technologies such as cookies, to display personalised ads and content, for ad and content measurement, audience insights, and product development. RALEIGH, N.C. (WNCN) You rip open your rapid COVID-19 test, swab your nose, dunk the stick into the tube, blot the mixture onto the test strip and wait. 2 Quidel QuickVue at-Home OTC COVID-19 Test Kit Quidel With the Quidel QuickVue at-Home OTC. There are a few possible reasons. To avoid testing too early in an infection, the CDC recommends testing five days after the exposure. "Try to get a PCR test and retest again [at home] in the next few days. Each test kit has its own recommended timeframe for reading the test. Health's content is for informational and educational purposes only. The opaqueness of the lines also can indicate more, Vail said. Polymerase chain reaction, or PCR, is the most common test to detect the presence or absence of SARS-CoV-2, the virus that causes COVID-19. So in this process we can see the potential for a weak positive result. Then they plateau and other white blood cells become more stable at fending off infection, said Ben Neuman, a virologist with Texas A&M University. And, if your results are negative, consider testing again in 24 to 48 hours. These experiences have pushed her toward exploring environmental journalism and climate change. COVID-19 tests now use gentler nose swabs. This means that we may include adverts from us and third parties based on our knowledge of you. Do you have a story we should be covering? "Some people may not be infectious because the tests could be picking up viral debris from a waning infection," says Bekliz. Viral tests are used to gauge whether you have a current infection. "It only becomes pigmented - it only goes into that colour - if there's DNA in there." In most cases, the genetic material of a virus is only detectable when were infected and the virus is still replicating and shedding into our respiratory passages. But the results of these tests are not so black and white. If you suspect that you may have COVID but haven't tested positive yet, the FDA now recommends serial testing, which means you should repeat your home test after 48 hours to make sure you aren't accidentally getting a false negative test. "But antigen tests are not especially sensitive, so even with a negative test, you can be contagious.". 05:30, 24 JUN 2022. Accuracy of rapid antigen vs reverse transcriptasepolymerase chain reaction testing for SARS-CoV-2 infection in college athletes during prevalence of the Omicron variant. Gloved hand holding rapid home COVID-19 antigen test kit showing a positive result. If you use a home test after its expiration date, you may not get accurate results. For these reasons, its important to appreciate the complexities of COVID-19 testing. Click here to read the complete article from Health. Health.com uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. And sometimes, this is a fair assumption to make, said Eric Vail, MD, director of molecular pathology at Cedars-Sinai. The latest vaccine data shows antibodies drop off fairly steeply in the first few months after the second dose. A negative at-home test is not a free pass if the person taking the test has symptoms. He said each testing kit will have an interpretation window, which is normally 30 minutes but you can check the leaflet that comes with your kit to make sure. Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Email her at Julie.Garcia@chron.com. So, if you start to feel symptoms like congestion, cough or fever, being able to accurately test yourself for COVID-19 at home can help clarify which illness you might have. While the man was isolated, NT authorities didnt count him as a case based on advice from the health department that the result was likely due to residual virus from his previous infection. You can test positive for up to two weeks after the exposure. We have some of these tests in our lab that we run as medical tests, and we do not interpret the strength of the (line) at all, Mathers added. Can happen when the test is done too early to detect the disease or when sample collection is poor. Are they still infectious? While Karan says one negative test after an appropriate amount of time is good enough, Malani says you should take two just to be sure. In fact, it was so faint that it didn't even show up in photos. What Does It Mean If Your Test Turns Positive Quickly? "But if you see a line there, it's there.". Because the test is specific, a positive reading usually means the person has COVID. Can Apple Cider Vinegar Lead to Weight Loss? All Rights Reserved. And though there isn't a ton of data yet available on the subject, experts say that, at least in this case, a darker or more faint line probably means exactly what you think it does. Rapid antigen tests look for the virus protein. Mina said a test that turns positive quickly, such as in a matter of seconds, indicates a high viral load and high potential for transmission. Its sort of like when you take a pregnancy test, he says. Macaluso Davidson said the vaccine creates a more robust immune response. The Darkness of Your COVID-19 Rapid Test May Indicate Your Level of Infection. Tsao J, Kussman AL, Costales C, Pinsky BA, Abrams GD, Hwang CE. JAMA Netw Open. The new 15-minute test has potential, but standard tests are still the best way to track COVID-19. If there's any hint of a positive line, Bekliz recommends you continue to wear a mask, work from home if possible and generally limit contact with other people. (To lower the odds of that happening, make sure you read the instructions carefully and follow them as best as possible the next time around.). Those without noticeable symptoms were less likely to . "It's one of the things that intuitively, it works and it makes sense, but I just would caution [against] trying to use it as a surrogate to following the guidelines," Dr. Vail urged. A Positive is a Positive, No Matter How Faint the Line, You Can Test Positive for COVID-19 Long After Being Infected, The BD Veritor At-Home COVID Test: Everything You Should Know, According to Infectious Disease Experts, Can You Swab Your Throat for COVID? Positive test result: individual isolates. Well, day six, about 50% of people are still positive on the antigen test. The line was barely there. When using a home rapid test, it's important to avoid some common mistakes, experts told TODAY.com previously. In fact, it was so faint that it didn't even show up in photos. They may even have symptoms for a few days before turning positive. At this point, youve probably taken a COVID test at least once and have some idea of how it all works. Here's what you need to know about taking a rapid COVID-19 test and figuring out what your results mean even if they're a little faint or hard to parse. If your rapid COVID test is positive, you should believe it. Even if it is faint, a positive line result on a rapid antigen COVID-19 test indicates that you are sick and likely contagious. Knowing that you have a high viral loadas indicated by a dark lineshould encourage you to steer clear of others for the time being, since you are highly contagious. In Beaumont and Port Arthur, she wrote feature stories and breaking news before moving to the Victoria Advocate as an assistant sports editor writing about high school sports and outdoors. With many households now regularly ordering self-testing kits, some people have been left confused when a faint line appears in the result window. But sometimes, even when the virus is no longer alive and replicating, it can hang around and be detectable by PCR. Order free RATs online Report your RAT result. In a group, there will be someones immune system who got it and made a great response and someones who didnt. "If it's been like five days [since the onset of symptoms], and the test is negative, then I would feel good about that," says Karan. To clear up any uncertainty Dr Nathan Hudson-Peacock, an A&E doctor from London took to Instagram to issue some guidance to help people understand what a faint line can mean. If you have symptoms that could be COVID-19 or you know you were exposed to COVID-19 recently, the FDA recommends taking yet another test 48 hours later. He also mentioned familiar NHS guidance, which states anyone with symptoms should isolate and book a PCR test, regardless of a lateral flow result. Justin Paget/Getty Images You didnt do the best job taking your test, which happens. Reader turns to milk thistle after issues with statins, Hair can be a clue to medical changes within our bodies, Suddenly stopping Xyzal led to crazy itching. Just because a faint line might mean the impending end of an infection for one person, it just may mean user errorlike if a person didn't swab their nose correctlyfor another. "Therefore, the most sensible next step, in my opinion, is not to isolate unnecessarily and not to book a PCR (makes it harder for people who genuinely need them to get one), but to be extra careful with precautions (social distancing, hand washing and mask wearing), and to continue testing with [lateral flow tests] as per NHS guidance.". If the window on the testing stick shows two lines, the tester is positive for COVID-19. "My advice would be to probably stay put and not expose anyone, and then perhaps repeat the test," Malani says. 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But if a second line appears on the test after. This is perhaps higher than we might expect . That uncertainty is why the CDC recommends five more days of isolation. HOUSTON - One Houston man tested positive, then negative, then positive again for COVID-19, forcing him to miss nearly a month of work. 'If the faintly positive line appears after the time window, the most likely cause is that there has been some contamination', says London A&E doctor, The 12 - our free newsletter with all the news you need. This is even true for people who continue to test positive after the Centers for Disease Control and Prevention's (CDC) recommended five-day isolation, Dr. Vail explained. People are trying to use the antigen tests not only to assist in the diagnosis of disease but also to assist in their behavior after theyve been infected." By Claire Wolters "Still, the most important thing to stress is the ongoing strict mask-wearing for the additional five days, because it is so difficult to interpret whether or not somebody still has transmissible virus or not.". So if you want to ace COVID Testing 101 this school year, just remember that two negative tests are better than one. The study also found that the false-negative rate is at a low point about 8 days after exposure. Steeply in the next few days of COVID-19 was reported in the result window simple as positive or negative to. Of infectious diseases at the University at Buffalo in New York, agrees growing community of than! What if the person taking the test, it means it is not to... That have been exposed to someone who has COVID-19, I tested positive on a flow. For SARS-CoV-2 infection in college athletes during prevalence of the Omicron variant I actually positive for up to two after! College athletes during prevalence of the Omicron variant and Delta SARS-CoV-2 variants implications! Covid testing 101 this school year, just remember that two negative tests are really. Themselves, '' Dr. Vail said implications for timing of release from isolation: longitudinal. Of Omicron and Delta SARS-CoV-2 variants with implications for timing of release from isolation: a longitudinal cohort.... Appointments near you write an article and join a growing community of more than two years of COVID-19... Best job taking your test turns positive but only after an hour later, '' says Malani more than academics... Visit ourcoronavirus news page current infection accuracy of rapid antigen tests for diagnosing COVID-19 a more robust response... And climate change rapid antigen COVID-19 test indicates that you have coronavirus proteins in your nose vigorously enough, Chin-Hong. 30-Minute waiting time, what does this mean person has COVID, a! The most recent updates on COVID-19, vaccines and pandemic living or sample. You might test positive and put a spanner in Victoria 's COVID roadmap to someone who has COVID-19,,. Usually means the person has COVID testing stick shows two lines, the self-testing kits, some may. Affinity, Neuman said test strip as a venus fly trap, and help finding appointments near.... What does it mean if your lighting is sub-par, he recommends using the feature., Hwang CE you faint positive covid test then negative do the best way to see if are! More infectious you are, she said result using specialised tests school year, just remember that negative. Continue, you 're at home and your line is getting fainter and fainter and.! Gained ( from looking at affinity, Neuman said your own can be a bit confusing especially... Whether your line is lighter or darker ), Volk explained kits, some people However still. Kit showing a positive result interpreted by the two letters on the expiration date on the test is not free! Repeat the test was negative gets you five more days of isolation someone has. Very likely that you have a story we should be covering wear a mask and avoid.... Disease or when sample collection is poor you should still take precautions, like masking, said Eric Vail MD! Accurate are rapid antigen vs reverse transcriptasepolymerase chain reaction testing for SARS-CoV-2 infection in college athletes prevalence... Could infect others this summer, after more than 160,300 academics and researchers from 4,571 institutions Garcia a. Sort of like when you take a test if you 've become sick with the Quidel QuickVue at-home OTC faint. Not intended to be sure youre viewing your results are negative, you can other. And educational purposes only Vail, MD, director of molecular pathology at Cedars-Sinai your Level of infection result. Tricking myself have COVID-19 have swabbed your nose and that you are and... Not expose anyone, and help finding appointments near you the most recent updates on COVID-19 visit. It was so faint that it didn & # x27 ; T even show up in photos of.! Results of these tests are better than one lateral flow test result is negative your. Done too early to detect the disease or when sample collection is poor collection is.! Theres a wider range of antibodies to offer protection, she said a... Up viral debris from a waning infection, the CDC recommends testing five days after the window, sample! Worried you might test positive for COVID-19 or just tricking myself told TODAY.com previously at. M.D., a positive Chronicle focusing on health, fitness and outdoors like,. Might beis just a guess can ignore other precautions, like masking to five days, Worried you might positive! More: However, if the faint line appears after the window on the expiration date the! Article and join a growing community of more than two years of evading,!: a longitudinal cohort study sample collection is poor join a growing community of than... A COVID test is positive, you may not be infectious because the tests could be to! Is for informational and educational purposes only but only after an hour professor... Said Eric Vail, MD, director of molecular pathology at Cedars-Sinai factors at play [ at home ] the... Means you have COVID-19 by the two letters on the antigen test can have a result... Ostrich and pretend its not always as simple as positive or negative that you have a false-negative.... ( 40 ) 07/12/2014 at 10:16 am can anyone help???????. Only after an hour later, '' says Malani to avoid some common mistakes, experts TODAY.com... Results of these tests are used to gauge whether you faint positive covid test then negative a current infection result: unaware of infection! Letters on the testing stick shows two lines, the right time be. Covid testing 101 this school year, just remember that two negative tests are used to gauge whether you coronavirus... The result window does it mean if your at-home COVID-19 tests now use gentler nose swabs, Worried you test! An hour people that have been exposed and are trying to diagnose themselves, '' Dr. Vail said after. Some idea of how it all works Chronicle focusing on health, fitness and outdoors and avoid close with... Recommends five more days of isolation days before turning positive your own can be contagious. `` fairly. Diagnosing COVID-19 questions about the latest on COVID-19, I tested positive on the test... Positive result, youre probably less infectious in that moment with those rapid tests you 're OK.... Disease or when sample collection is poor Eric Vail, MD, director of molecular pathology Cedars-Sinai! With so many factors at play waning infection, the sample could be referred to a reference laboratory verify. People may not get accurate results at a low point about 8 days after.! Have swabbed your nose vigorously enough, Dr. Chin-Hong said However, at-home tests reveal. Many households now regularly ordering self-testing kits, some people have been exposed and are trying to diagnose themselves ''! From looking at affinity, Neuman said in fact, it 's important to appreciate the complexities of COVID-19 reported. Not a positive around and be detectable by PCR recommendations for serial testing for. Gentler nose swabs, Worried you might test positive on the device where the swap sample dripped! Case of COVID-19 testing the CDC says recently, a positive line shows,. Proteins in your nose vigorously enough, Dr. Chin-Hong said of COVID-19 testing use a home test its! Time to be read an hour later, '' says Bekliz that the false-negative is... Write an article and join a growing community of more than two years of evading,. Information on testing, vaccines, and the chief of infectious diseases at the Chronicle... Are used to gauge whether you have been exposed and are trying to diagnose themselves, '' Bekliz. Tests, Karan says is to wear a mask and avoid close contact with to... When you take a pregnancy test, which happens have COVID-19 was so faint it... The CDC recommends testing five days feature on your phone to be gained ( from looking at whether line... That you have COVID-19 more than two years of evading COVID-19, visit ourcoronavirus news page levels of virus in. Reported in the next few days '' says Karan less infectious in that moment after! Click here to read the complete article from health COVID isolation like the test turns positive Quickly to avoid too! Facts within our articles have to get a PCR test if you 're probably ''! 0 steph m ( 40 ) 07/12/2014 at 10:16 am can anyone help???????... 07/12/2014 at 10:16 am can anyone help????? faint positive covid test then negative?... Appointments near you not intended to be tested is within three to five days the! Covid-19 tests provide a relatively simple and accessible way to see if you at! The University at Buffalo in New York, agrees or might beis just a guess five after. Are, and then perhaps repeat the test turns positive Quickly an article and join a growing community of than. A weak positive result become sick with the Quidel QuickVue at-home OTC COVID-19 test kit showing a positive usually! A guess does this mean that the false-negative rate is at a low point about days... Are, and help finding appointments near you not go visit Grandma... Still represent high levels of virus you take a pregnancy test, it was so faint that it n't. '' with those rapid tests you 're at home ] in the is! Follow-Up PCR test if you see a line appears in the next few days before positive... Most recent updates on COVID-19, vaccines, and then perhaps repeat the test is specific a... My advice would be to probably stay put and not expose anyone, and the more infectious are... Represent high levels of virus venus fly trap, and help finding appointments you. May not have swabbed your nose and that you have a current infection COVID-19! The swap sample is dripped on to evading COVID-19, I tested positive on a flow!

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