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Re:Preliminary test results suggest 21% of NYC residents hav... by __blockcipher__ on Thursday April 23, 2020 @09:29PM (#22963691)
It is well established.

https://en.wikipedia.org/wiki/Memory_T_cell

You are conflating active circulating antibodies with the memory T cells. Which is literally what my entire comment was about.

Re:Preliminary test results suggest 21% of NYC residents hav... by mlyle on Friday April 24, 2020 @12:05PM (#22969534)
Of course, there's other confounds. Like the somewhat recent discovery that we end up with antigen experience / "memory" of diseases that we've never contracted. (Perhaps from viral fragments in the environment??)