A post from CGI member, Mike:

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...to believe that anyone can still believe in this covert 19 joke.

And yet, maskers.

Snip:

Kampen and colleagues studied the shedding of infectious virus in 129 hospitalized patients with COVID-19. The duration of infectious virus shedding ranged from 0 to 20 days post-onset of symptoms, and the probability of detecting infectious virus dropped below 5% after 15 days post-onset of symptoms. They also report that the amount of virus is associated with the detection of infectious SARS-CoV-2, and once neutralizing antibodies are detected in the serum the virus becomes non-infectious.

When the samples were taken seemed important for viral culture. In a case report, SARS-CoV-2 RT-PCR continued to detect the virus until the 63rd day after symptom onset whereas the virus could only be isolated from respiratory specimens collected within the first 18 days. In a cohort of 59 patients, fecal discharge was longer after respiratory shedding stopped. Gupta et al. w15 reported the duration for fecal shedding of viral RNA after clearance of respiratory samples ranged from 1 to 33 days and in one patient was up to 47 days from symptom onset.

Snip:

This detection problem is ubiquitous for RNA viruses detection. SARS-CoV, MERS, Influenza Ebola and Zika viral RNA can be detected long after the disappearance of the infectious virus.

The immune system works to neutralise the virus and prevent further infection. Whilst an infectious stage may last a week or so, because inactivated RNA degrades slowly over time it may still be detected many weeks after infectiousness has dissipated.

https://www.cebm.net/covid-19/infectious-positive-pcr-test-result-covid-19/