"While the latest research suggests that antibodies against Covid-19 could be lost in just three months, a new hope has appeared on the horizon: the enigmatic T cell."
So all you can find is an article hoping that "magical T-Cell immunity" exists -- from July of 2020. LOL. You are sounding more like Jem every day.
Nope, I'm posting several studies prior, but you decided to hang onto a journalist's interpretation of things.
The YouTube videos do a good job of explaining if you struggle with reading
https://www.jci.org/articles/view/145476/pdf
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