T cell reactivity against SARS-CoV-2 was observed in unexposed people; however, the source and clinical relevance of the reactivity remains unknown. It is speculated that this reflects T cell memory to circulating ‘common cold’ coronaviruses.
As data start to accumulate on the detection and characterization of SARS-CoV-2 T cell responses in humans, a surprising finding has been reported: lymphocytes from 20–50% of unexposed donors display significant reactivity to SARS-CoV-2 antigen peptide pools1,2,3,4.
In conclusion, it is now established that SARS-CoV-2 pre-existing immune reactivity exists to some degree in the general population. (See link for full article)
“The entire world simply claimed that there was no immunity…..that wasn’t science, but pure speculation based on a gut feeling that was then parroted by everyone.” Beda Stadler
“The likelihood that these latest admissions by the WHO about asymptomatic transmission reach the mainstream airwaves is minimal, at best.”