If the dance starts again, then it seems to me that T-cell immunity is the key.
Also, I am sure it will start again. There seems no way it can be stopped unless you are going for zero-covid... but that way lies dystopian insanity :)

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Could be.

However, the question then is, who told you that you can only gain T-cell immunity from virus itself?

My first link says (haven't looked further):

Researchers in the United States have shown that the Pfizer/BioNTech and Moderna messenger RNA (mRNA) vaccines are effective at generating T-cell immunity against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) – the agent that causes coronavirus disease 2019 (COVID-19).

The team found that vaccinated individuals developed robust T-cell responses to the SARS-CoV-2 spike protein that the virus uses to bind to and infect host cells.

// news-medical.net.

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Yeah I looked into this yesterday - not peer reviewed :)

Also from my research it seems that the current crop of vaccines aren't focussed on T-cell immunity. So-called "next-generation" vaccines might do so.

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