Actually, you can't travel to the United States for a minimum of 10 days once you tested positive (per CDC site:)
https://www.cdc.gov/coronavirus/2019-ncov/travelers/international-travel/index.html#do-not-travel
Do NOT travel if…
You have COVID-19 symptoms, even if you recovered from COVID-19 within the past 90 days or are up to date with your COVID-19 vaccines.
You tested positive for COVID-19.
Do not travel until a full 10 days after your symptoms started or the date your positive test was taken if you had no symptoms.
You are waiting for results of a COVID-19 test.
If your test comes back positive while you are at your destination, you will need to isolate and postpone your return until it’s safe for you to travel. Your travel companions may need to quarantine.
You had close contact with a person with COVID-19 and are recommended to quarantine.
Do not travel until a full 5 days after your last close contact with the person with COVID-19. It is best to avoid travel for a full 10 days after your last exposure.
If you must travel during days 6 through 10 after your last exposure:
Get tested at least 5 days after your last close contact. Make sure your test result is negative and you remain without symptoms before traveling. If you don’t get tested, avoid travel until a full 10 days after your last close contact with a person with COVID-19.
Properly wear a well-fitting mask when you are around others for the entire duration of travel during days 6 through 10. If you are unable to wear a mask, you should not travel during days 6 through 10.