Just got around to reading this.
Here's what happened to me.... I'm pretty sure I got CV in early Feb 2020 whilst travelling abroad, had a raging headache and temperature but no cough and at the time I thought it was the flu. Lasted for about 3 days.
Got back home and in early April 2020 (during lockdown) I had excruciating arthritic type pain in my hands, elbows and shoulders. Called the GP who suggested that it was a viral infection (that was a "no shit Sherlock" moment for me!). Over the next couple of weeks I had a series of blood tests done and at the request of the GP also had the voluntary CV antibody test.... which came back negative. The GP suggested that might not be unusual as not everyone who succumbs to a virus will create antibodies.
Since then I've not had a sniffle, cough, cold or any arthritic pain. Have been out and about in UK/IOM for best part of the last 5 months (in some enclosed areas, bars etc that most would avoid under the circumstances) and so far managed to avoid CV. So it seems my T cells have been doing what they were designed by nature to do.
It's all in the T cells, so to speak.
And the 2 x vaccines, of course.