Again, we don’t know that.
For instance, do you know anyone who claims to have had CoupFlu twice who’s had a titer done after their first suspected go round?
To my mind, without the results of that titer, given the utter uselessness of the PCR tests, a person doesn’t know if he/she’s had the coof or not.
As for the so-called long COVID...
Sigh.
Don’t get me started.
scroll down...you will see someone having the problem.