Yeah, some people are having trouble clearing the virus.
There are several possibilities--true reinfection after completely clearing the virus, viral counts reduced to undetectable but not zero and then increasing again, or virus is present and replicating or just sequestered somewhere other than the nasopharynx which I assume is the site being sampled. My money would be on 2 or 3. I think it will take a long time before we know if true reinfection can occur. Best to ignore the possibility because if there is truly no immunity the human race is doomed no matter what we do.
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