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The CDC states that a person can end home isolation when:
At least 10 days since symptoms first appeared AND
At least 24 hours with no fever without fever-reducing medication AND
Other symptoms of COVID-19 are improving
https://www.cdc.gov/coronavirus/2019-ncov/if-you-are-sick/isolation.html
Therefore, no need for further testing and this person is free to re-join society. However, this person (and everybody else) should continue to observe masking, physical distancing, hand washing, etc. to continue to help prevent further spread of the virus.