The T-Detect (T-cell) test can tell you whether you had COVID even months later

[admin]

The T-Detect test can tell you whether you had COVID months or even decades later. In recent history Spanish Flu T-cells were found to be present in elderly that survived that 1918 pandemic.

https://www.t-detect.com/

"How does T-Detect COVID work?

T cells are the first responders of the adaptive immune system and activate the antibody response. While antibodies to SARS-CoV-2 (the virus that causes COVID-19) naturally wane and are detectable in the shorter term, T cell responses can persist in the blood long after antibody responses wane.1,2,4

The T-Detect COVID test can detect T cells in a blood sample that can remain for up to several months after symptoms appear.1,2,3"

[admin]

And of course if you exhibit T-cell immunity you have acquired broad based and perhaps permanent immunity to SARS-CoV-2 and many of its variants that may come along.
https://www.covid-19forum.org/index.php?topic=772.0

[admin]

1:08 mark on immune memory function after antibodies are no longer seen as present
https://thehighwire.com/videos/episode-242-the-vanden-bossche-interview/