PCR can remain positive for several weeks. Antigen testing (all home tests) usually are negative after 5-10 days. Transmission to other persons is rare beyond 10 days, even if the antigen test is still positive. Therefore, official advice is that you can stop isolating and return to work, shopping, etc (with mask and social distancing) 10 days after onset, regardless of test results.
Answered 1/10/2022
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When you are symptom free for three days or have a negative test at day 10, from the positive test, whichever is longer then test.
Answered 1/10/2022
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