“the best we can say is that sensitive scientific tests can detect differences in the #immunesystems of people infected with #SARSCoV2 compared with the ever-dwindling cohort of those who have never been infected at all. Whether these differences—which vary from study to study—add up to a molecular “#immunesignature” of #COVID remains to be seen. Any clues may be particularly valuable in untangling why a subset of patients have symptoms that last a few months or longer”

https://slate.com/technology/2023/01/immunity-covid-research-airborne-aids-debunk.html