Earlier quoted context omitted.
I'm certainly confused now. What is this mechanism that can successfully destroy ... hundreds? thousands? millions? of virus particles but is unable to stop them reproducing? Are you arguing that they reproduce after they've been destroyed? Or maybe that the COVID virus is a permanent infection? For a body to rid itself of a viral disease it needs to achieve sterelising immunity. That is what it means to recover afte…
There's no sterilising immunity. That's a gross oversimplification of the incredibly complex thing that the immune system is. Immune response isn't linear. Likewise, viral reproduction isn't linear. They're not even constant within the same tissue. So whatever happens will depend on the virus, on the viral load, where it appears, and previous type and kind of immunity, and the speed of that immune response. Fun fact:…
> To the end of week 43 in 2021 (to 31 October 2021) 72,264 possible reinfections have been identified, of which 441 have been confirmed by identification of genetically distinct specimens.
That is from a total of 7.9 million positive cases, i.e. reinfection rate is ~0.01% to 1%. That means at least 99% of Covid-recovered people in the UK were not reinfected. Some textbooks from recent decades may call that "sterilizing immunity". Note that some words have been redefined by government agencies since 2020, including the term "vaccine" (definition updated by the CDC as recently as Sept. 2021). At this point, usage of some evolving and contested terms should be accompanied by a version number, date and changeset hash.
Regardless of terminology, the UK numbers show a 1% chance of reinfection upon exposure. If someone takes precautions to reduce their exposure to infected people (e.g. people with symptoms / positive test, or a crowded indoor space with poor ventilation), then the risk of reinfection will be a small number X 1%.