Important update: Healthcare facilities
CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Learn more
UPDATE
Given new evidence on the B.1.617.2 (Delta) variant, CDC has updated the guidance for fully vaccinated people. CDC recommends universal indoor masking for all teachers, staff, students, and visitors to K-12 schools, regardless of vaccination status. Children should return to full-time in-person learning in the fall with layered prevention strategies in place.
UPDATE
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. For purposes of entry into the United States, vaccines accepted will include FDA approved or authorized and WHO Emergency Use Listing vaccines. More information is available here.
UPDATE
Travel requirements to enter the United States are changing, starting November 8, 2021. More information is available here.

How to Determine a Close Contact for COVID-19

How to Determine a Close Contact for COVID-19
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Children and Adults in All Indoor and Outdoor Settings (Excluding K-12 School Settings)

Was the person less than 6 feet away from someone with confirmed or suspected COVID-19? Consider time spent with someone with COVID-19 starting 2 days before the infected person developed symptoms, or the date they were tested if they do not have symptoms, until they started isolation.

Has the person been in the presence of someone with confirmed or suspected COVID-19 for a cumulative total of 15 minutes or more over a 24-hour period?

If the answers to the questions above are both yes, the person is a close contact, regardless of whether the person was wearing a mask properly.

If the answer to either of the questions above is no, the person is not a close contact.

What should the close contact do?

If they are not up to date on vaccines

 

The close contact needs to quarantine for at least 5 days from the date of last close contact.

The close contact should wear a well-fitting mask when around others for 10 days from the date of the last close contact with someone with COVID-19.

If the close contact does not have COVID-19 symptoms, they should watch for symptoms for 10 days and get tested at least 5 days after the close contact.

If they test positive, continue to isolate.

If they are up to date on vaccines

 

If they have taken the full series of a COVID-19 vaccine and boosters as recommended, they are up to date.

The close contact does not need to quarantine.

The close contact should get tested at least 5 days after close contact. Watch for symptoms and wear a well-fitting mask while around other people for 10 days from the date of last close contact.

Regardless of vaccination status, if a close contact develops symptoms, they should isolate and get tested immediately.

If they test positive, continue to isolate.

If they have had COVID-19 within the past 90 days, completed isolation, and recovered

 

The close contact does not need to quarantine.

The close contact should watch for symptoms and wear a well-fitting mask when around others for 10 days.

Close contacts who had a prior infection in the past 90 days and who have symptoms should isolate immediately and get tested.

If they test positive, continue to isolate.