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I'm not so sure. JJ Couey having dug through the immunological literature prior to covid postulates that immune memory to coronaviruses is primarily TCell and nk cell based but not towards the spike but towards non-structural viral proteins (eg RNA dependent RNA polymerase). These proteins are displayed on cell receptors early on during infection. They are functionally constrained and evolutionarily conserved across coronaviruses. Through linked recognition they may trigger bcell activation and memory bcells but those are neither necessary nor sufficient to abrogate an infection.

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It fits the data very well, so I would say it has enough support for more research.

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