Testing negative for Omicron (COVID-19) varies, but typically, most people test negative on rapid antigen tests within 5-10 days after symptoms start, while PCR tests can show positive for weeks or months due to detecting viral fragments, even when no longer infectious. The key is that antigen tests become negative when you're likely no longer contagious, which is why they're used for clearance.
Some people can test positive for COVID-19 for weeks or even months on PCR tests, but there is good news: people are not likely to be contagious for that long from a single infection, even if they test positive, and therefore are unlikely to transmit the virus to others.
You may get a PCR test, which can show a positive result for up to three months after recovery.
COVID-19 is contagious but there are things you can do to help reduce your risk. COVID-19 tends to be most contagious in the first 1-2 days before and up to 8-10 days after symptoms begin. It's important to monitor your symptoms and follow the guidance of your healthcare provider.
from up to 48 hours before your symptoms appear. from up to 48 hours before you test positive if you have no symptoms – even if you don't feel sick, you can still spread the virus. until your symptoms are gone, which can be up to 10 days.
Once the virus lands on a porous material like a fabric, the droplets evaporate much quicker than they do on a hard surface. However, studies have shown the virus can last about two days on some fabrics. It's unlikely you'll get COVID from your bedding, though.
After a positive test result, you may continue to test positive for some time. Some tests, especially NAAT tests, may continue to show a positive result for up to 90 days. Reinfections can occur within 90 days, which can make it hard to know if a positive test indicates a new infection.
When your symptoms are getting better overall and you have not had a fever (and are not using fever-reducing medication) for at least 24 hours, you are typically less contagious, but it still takes more time for your body to fully get rid of the virus.
CDC guidelines say that if you've been sick, you should isolate yourself at home until all of these things are true: You haven't had a fever for 24 hours without using a fever-reducing medicine. Your symptoms are better, though they might not be totally gone. It's been at least five days since your symptoms started.
Key Points: In a highly immune adult population, median SARS-CoV-2 viral loads by cycle threshold and antigen measurements peaked on the fourth day of symptoms, with implications for testing practice.
Adalja says. “The less dark, the line is, the less viral material that is present,” he says. “This could reflect diminishing contagiousness, or the start of it.”
Isolation can be discontinued at least 5 days after symptom onset (day 0 is the day symptoms appeared, and day 1 is the next full day thereafter) if fever has resolved for at least 24 hours (without taking fever-reducing medications) and other symptoms are improving.
After taking Paxlovid, you may feel better several days before you receive a negative COVID test result. One study found that people who took Paxlovid as directed tested negative an average of 10 days after developing symptoms.
A new study from the Jaenisch lab suggests that some virus RNA can be reverse transcribed and inserted into the human genome, which may explain why some patients continue to test positive for COVID-19 even after recovery.
The immune response from a COVID-19 infection usually tamps down after 3-4 months, says Kawsar Talaat, MD, a vaccinologist and associate professor in the Department of International Health at the Johns Hopkins Bloomberg School of Public Health and the Johns Hopkins School of Medicine in Baltimore, Maryland.
At-home tests are accurate about 80% of the time. While 80% sounds decent for a grade on an algebra test, it's not perfect for a COVID-19 test. It means that 20% of the time — or 1 in 5 times to drive the math home — when a person is infected with COVID-19, the test is not picking up evidence of the virus.
7 Steps to Take After a Virus Has Hit Your Home
Day 4-5: Symptoms become more pronounced; fever, cough, and fatigue intensify. Day 6: Potential appearance of gastrointestinal symptoms like nausea or diarrhea. Day 7: Heightened symptoms which may include difficulty breathing and persistent chest pain.
Take Over-The-Counter Medications
Antivirals are most effective if started within the first 48 hours of symptoms. If used accurately, they can shorten the duration of illness by about 24 hours and decrease the risk of complications, especially in high-risk populations.
Transmission of COVID-19 from inhalation of virus in the air can occur at distances greater than six feet. Particles from an infected person can move throughout an entire room or indoor space. The particles can also linger in the air after a person has left the room – they can remain airborne for hours in some cases.
Antigen testing is recommended. If the result is negative, repeat testing should be done. You should NOT be retested if you tested positive for COVID within 30 days and do not have COVID symptoms.
Although not fully proven, large doses of vitamin C may help reduce how long a cold lasts. Large doses of vitamin C do not protect against getting a cold. Vitamin C may also be helpful for those exposed to brief periods of severe or extreme physical activity.
The symptoms are very similar to symptoms of other illnesses, such as colds and flu. Most people feel better within a few weeks, but it can take longer to recover. For some people, it can be a more serious illness and their symptoms can last longer.
Isolate for at least 5 full days after your symptoms start, or after your first positive test date if you don't have symptoms. Ending isolation: You can end isolation after 5 days if you test negative (use an antigen test) on Day 5 or later – as long as you do not have a fever and your symptoms are getting better.
June 26, 2025 – The new COVID-19 variant that now makes up about a third of U.S. COVID cases has a signature symptom: a painful sore throat that feels like "razor blades." "This 'razor blade sore throat' was reported as a common symptom in China," where the variant first emerged in May, said Matthew S.