FAQ: Positive tests: Isolation, quarantine, and re-testing
What happens after a positive test?
A positive PCR test has implications for both that individual and their close contacts. Here’s what happens in each case.
| I have no symptoms. | Isolate for at least 10 days after first positive test. |
| I have symptoms of COVID-19. | Isolate for at least 10 days after symptom onset and until fever free for at least 24 hours. |
| I am a close contact. | Quarantine for at least 10 full days from last potential exposure; self-monitor daily for symptoms through Day 14. |
December 16, 2020
If I don’t have symptoms, why won’t you do a second test to confirm that the first was not a “false positive?”
Public health authorities consider a positive PCR test to be a true positive, so a subsequent negative test would not change the requirement for isolation. This is consistent with the CDC’s current estimate that 40 percent of infected individuals are asymptomatic but still able to spread the virus.
September 3, 2020
How long will I have to isolate after a positive test?
At least 10 days. If you are:
- Asymptomatic: Isolate for 10 days after the first positive test.
- Symptomatic: Isolate for at least 10 days after symptom onset or until you have been fever free for at least 24 hours, whichever is longer.
- Severely ill: Isolate for at least 10 days and up to 20 days after symptom onset.
September 3, 2020
I’ve tested positive for COVID-19 infection; how soon do I need to be tested again?
Once you’ve tested positive for the virus, you do not need to be tested again for 90 days from symptom onset, if you became ill, or from the date of your positive test, if you remained asymptomatic.
However, if you develop symptoms of COVID-19 during that three-month period, and if clinicians cannot identify another cause for these symptoms, you may need to be re-tested at that time.
January 21, 2021
What is a “close contact?”
The CDC defines a “close contact” as “someone who was within 6 feet of an infected person for at least 15 minutes starting from 2 days before illness onset (or, for asymptomatic patients, 2 days prior to specimen collection) until the time the patient is isolated.”
September 3, 2020
I’ve been in close contact with someone who has tested positive; how long do I need to self-quarantine?
If you are a Covid Pass participant who comes to campus regularly, you will need to self-quarantine for at least 10 days.
The CDC, the Massachusetts Department of Public Health, and the City of Cambridge now offer two options for individuals to leave quarantine earlier than 14 days. MIT’s 10-day quarantine is the more stringent of those two options.
While you are quarantining, you must actively monitor yourself for symptoms and take your temperature at least once every day. You must continue this self-monitoring for a full 14 days from the date of your possible exposure to the virus, even after your 10-day quarantine has ended. If you develop even mild symptoms or a temperature of 100°F or higher, you must immediately self-isolate and contact MIT’s contact-tracing team to arrange testing.
Unless you develop symptoms, you do not need to be tested during the quarantine period. However, if you want to be tested, MIT’s contact tracers will work with you to schedule your test.
December 16, 2020
How do I regain access to campus after quarantining?
Your quarantine will continue for 10 full days. On Day 11, once the contact-tracing team has spoken with you to confirm that you have remained asymptomatic, they will lift your Covid Pass hold.
You should get tested at one of MIT’s regular Covid Pass surveillance-testing sites the first available testing day that you are due to be on campus. As long as your previous test was done within the last 14 days, you will be able to access campus buildings and proceed with your normal campus activities the same day. However, if your previous test result is 14 days old or older, you will need to wait for a negative test result before your campus access is restored.
Remember that you must continue to monitor yourself for symptoms for a full 14 days from the date of your possible exposure to the virus. If you develop symptoms, you should immediately self-isolate and contact MIT’s contact-tracing team.
December 16, 2020
