The strange thing is that we have loads of research done over decades about all of this. It appears that the prominent doctors on the news don't know anything about it. Everything pumped out for publicity is about a sixth grade understanding of biology and epidemiology; but we know a lot more, it's just that Fauci doesn't talk about it and neither does the nightly news. If the role of journalists and the government was to inform, we would have well written articles on the loads of studies we have.
Journalists should give advanced information in digestible form about topics you didn't need to know about, but which are currently relevant. Instead, we get sixth grade hand waving in propaganda form.
Things like adaptive immune response, T-cells, immune escape, antibody dependent enhancement, viral loads, and lots of other things could be explained well but simply. It's a tragedy of modernity that we have so much information and so little understanding.