Indeed you are right, there have been reports of precisely this happening in such patients: https://www.latimes.com/science/story/2021-01-30/long-term-covid-19

Indeed you are right, there have been reports of precisely this happening in such patients: https://www.latimes.com/science/story/2021-01-30/long-term-covid-19-patients-are-incubating-dangerous-new-coronavirus-strains https://www.latimes.com/science/story/2021-01-30/long-term-c... That's unrelated from my general point though. The virus is gone in almost all people reasonably quickly.