This probably flew under your radar (as it did mine) but two months ago, the US FDA increased testing recommendations for those who think they have been exposed to #COVID19. ONE NEGATIVE TEST ISN'T ENOUGH! It now recommends serial testing. If you receive a negative result on your first test and “do not have COVID-19 symptoms... test again 48 hours after the first negative test, then 48 hours after the second negative test, for a total of at least three tests.”
One of the real problems here is that the FDA and CDC have conflicting info(the CDC hasn't updated their since August 11th, 2022) and there's no real oversight anyway, so most companies are just making up their own policies at this point using parts of the CDC's 5-day guidance to suit their own cases.
The CDC deals with the FDA's ideas with a simple footnote basically saying to ignore testing as a criteria which has led to even less testing:
As noted in the Food and Drug Administration labeling for authorized over-the-counter antigen tests, negative test results do not rule out SARS-CoV-2 infection and should not be used as the sole basis for treatment or patient management decisions, including infection control decisions.
https://www.cdc.gov/coronavirus/2019-ncov/your-health/isolation.html
