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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. An infected person can spread COVID-19 starting 48 hours (or 2 days) before the person has any symptoms or tests positive for COVID-19.
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Yes, you are still considered a close contact even if you were wearing a mask while you were around someone with COVID-19. Masks are meant to protect other people in case you are infected, and not to protect you from becoming infected.
If you have been in close contact with someone who has COVID-19 you should follow CDC's quarantine guidance and get tested on Day 5, if possible.
People with COVID-19 can still spread the virus even if they don’t have any symptoms. If you were around someone who had COVID-19, it is critical that you follow CDC's quarantine guidance and get tested on Day 5, if possible.
If you have been around someone who was identified as a close contact to a person with COVID-19, closely monitor yourself for any symptoms of COVID-19. You do not need to self-quarantine unless you develop symptoms or if the person identified as a close contact develops COVID-19.