Quick Summary
SARS(v1) (2003 now died out) still shows memory T cells 17 years later with no additional exposures.
SARS(v1) T cells show robust cross-reactivity with the N protein of SARS-Cov-2 i.e. good chance of immunity to SARS-Cov-2.
Additionally some people no exposure to SARS(v1) or SARS-Cov-2 have SARS-Cov-2 memory T-Cells present possible expoure to Beta-Cov viruses from animals.
These people also have low homology to the common cold viruses.
The outlook is good for immunity being remembered for a long period of time and will be valid against other forms of Betacovid viruses. Best news I've heard in a long time.
(edit layout)
