Viral testing is recommended for individuals who are close contacts of persons with COVID-19. Fully vaccinated people should be tested 5–7 days after their last exposure. People who are not fully vaccinated should get tested immediately when they find out they are a close contact.

How long will asymptomatic people test positive for COVID-19?

In general, asymptomatic people may test positive for 1-2 weeks, while those with mild-to moderate disease often continue to test positive for a week or more after this.

Should I get tested for COVID-19 if I have no symptoms and I've been exposed?

Even if you don't have symptoms, you should get tested 3-5 days after your exposure. If you need help, health department staff can provide information about the best time to get a vaccine and resources for COVID-19 testing in your area. If your test result is positive, you have COVID-19 and should isolate for 10 days.

How long should I wait to get tested for COVID-19 after being exposed if I am fully vaccinated?

- If you have been fully vaccinated and around someone who has COVID-19 (close contact), you do not need to stay away from others (quarantine), or be restricted from work unless you develop COVID-like symptoms. We recommend that you get tested 3-5 days after your last exposure to someone with COVID-19.

When should you do a confirmatory test for COVID-19?

Confirmatory testing should take place as soon as possible after the antigen test, and not longer than 48 hours after the initial antigen testing.

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Does an antibody test diagnose an active COVID-19?

Antibodies can take several days or weeks to develop after you have an infection and may stay in your blood for several weeks after recovery. Because of this, antibody tests should not be used to diagnose an active coronavirus infection.

How long does it take for symptoms of COVID-19 to appear after exposure?

Symptoms may appear 2 to 14 days after exposure to the virus.

Should I get tested after a close contact with someone who has COVID-19 if I am fully vaccinated?

• If you've had close contact with someone who has COVID-19, you should get tested 3-5 days after your exposure, even if you don't have symptoms. You should also wear a mask indoors in public for 14 days following exposure or until your test result is negative.

What should you do if you have been around a person with COVID-19?

For Anyone Who Has Been Around a Person with COVID-19

Anyone who has had close contact with someone with COVID-19 should stay home for 14 days after their last exposure to that person.

Should I be tested if I have been in close contact with someone who has COVID-19?

If you have been in close contact with someone who has COVID-19, you should be tested, even if you do not have symptoms of COVID-19. The health department may be able to provide resources for testing in your area.

Should vaccinated people get tested for COVID-19?

People who are fully vaccinated should get tested 3-5 days after coming into close contact with someone with COVID-19 and wear a mask indoors in public for 14 days or until they test negative. If symptoms develop, they should isolate and get tested immediately.

What should I do if I've been exposed to a person with COVID-19 and I have fully recovered from a COVID-19 infection in the previous 90 days?

Someone who tested positive for COVID-19 with a viral test within the previous 90 days and has subsequently recovered and remains without COVID-19 symptoms does not need to quarantine. However, close contacts with prior COVID-19 infection in the previous 90 days should:
• Wear a mask indoors in public for 14 days after exposure.
• Monitor for COVID-19 symptoms and isolate immediately if symptoms develop.
• Consult with a healthcare professional for testing recommendations if new symptoms develop.

When is someone with COVID-19 infectious?

The onset and duration of viral shedding and the period of infectiousness for COVID-19 are not yet known with certainty. Based on current evidence, scientists believe that persons with mild to moderate COVID-19 may shed replication-competent SARS-CoV-2 for up to 10 days following symptom onset, while a small fraction of persons with severe COVID-19, including immunocompromised persons, may shed replication-competent virus for up to 20 days. It is possible that SARS-CoV-2 RNA may be detectable in the upper or lower respiratory tract for weeks after illness onset, similar to infections with MERS-CoV and SARS-CoV. However, detection of viral RNA does not necessarily mean that infectious virus is present. Based on existing literature, the incubation period (the time from exposure to development of symptoms) of SARS-CoV-2 and other coronaviruses (e.g., MERS-CoV, SARS-CoV) ranges from 2–14 days.

How long does isolation last for asymptomatic people during the COVID-19 pandemic?

For people who are infected but asymptomatic (never develop symptoms), isolation and precautions can be discontinued 10 days after the first positive test.

Can patients who have recovered from COVID-19 continue to have detectable SARS-CoV-2 RNA in upper respiratory specimens?

• Patients who have recovered from COVID-19 can continue to have detectable SARS-CoV-2 RNA in upper respiratory specimens for up to 3 months after illness onset in concentrations considerably lower than during illness; however, replication-competent virus has not been reliably recovered and infectiousness is unlikely.

Are recovered persons with persistent positive test of COVID-19 infectious to others?

Persons who have tested persistently or recurrently positive for SARS-CoV-2 RNA have, in some cases, had their signs and symptoms of COVID-19 improve. When viral isolation in tissue culture has been attempted in such persons in South Korea and the United States, live virus has not been isolated. There is no evidence to date that clinically recovered persons with persistent or recurrent detection of viral RNA have transmitted SARS-CoV-2 to others.

Despite these observations, it’s not possible to conclude that all persons with persistent or recurrent detection of SARS-CoV-2 RNA are no longer infectious. There is no firm evidence that the antibodies that develop in response to SARS-CoV-2 infection are protective. If these antibodies are protective, it’s not known what antibody levels are needed to protect against reinfection.

Who is considered a close contact of someone with COVID-19?

For COVID-19, a close contact is anyone who was within 6 feet of an infected person for a total of 15 minutes or more over a 24-hour period (for example, three individual 5-minute exposures for a total of 15 minutes). An infected person can spread COVID-19 starting from 2 days before they have any symptoms (or, if they are asymptomatic, 2 days before their specimen that tested positive was collected), until they meet the criteria for discontinuing home isolation.

How long do you need to stay home after coming into close contact with someone who has COVID-19?

Anyone who has had close contact with someone with COVID-19 should stay home for 14 days after their last exposure to that person.

Am I considered a close contact for COVID-19 if I was wearing a mask?

A person is still considered a close contact even if they were wearing a mask while they were around someone with COVID-19. You can call, text, or email your contacts. By letting your close contacts know they may have been exposed to COVID-19, you are helping to protect everyone.

What steps should you take after coming into close contact with someone who tested positive for COVID-19?

• Stay home for 14 days after your last contact with a person who has COVID-19.
• Watch for fever (100.4◦F), cough, shortness of breath, or other symptoms of COVID-19.
• If possible, stay away from others, especially people who are at higher risk for getting very sick from COVID-19.

What should vaccinated people do if they come in contact with someone who has COVID-19?

Fully vaccinated people who have come into close contact with someone with COVID-19 should be tested 3-5 days following the date of their exposure and wear a mask in public indoor settings for 14 days or until they receive a negative test result. They should isolate if they test positive.

Can someone test negative and later test positive on a viral test for COVID-19?

Yes, it is possible. You may test negative if the sample was collected early in your infection and test positive later during this illness. You could also be exposed to COVID-19 after the test and get infected then. Even if you test negative, you still should take steps to protect yourself and others. See Testing for Current Infection for more information.

Can an infected person spread COVID-19 before showing symptoms?

An infected person can spread COVID-19 starting 2 days before the person has any symptoms or tests positive. People who have COVID-19 don't always have obvious symptoms. A person is still considered a close contact even if they were wearing a mask while they were around someone with COVID-19.

What are some of the common symptoms of the COVID-19 disease?

Symptoms may include: fever or chills; cough; shortness of breath; fatigue; muscle and body aches; headache; new loss of taste or smell; sore throat; congestion or runny nose; nausea or vomiting; diarrhea.

What are some of the mild symptoms of COVID-19?

Mild Illness: Individuals who have any of the various signs and symptoms of COVID-19 (e.g., fever, cough, sore throat, malaise, headache, muscle pain) without shortness of breath, dyspnea, or abnormal chest imaging.