This could begin the process of tossing the asymptomatic boogeyman out the window:
"Notably, we detected SCoV2 cross-reactive T cells in 81% of unexposed individuals..."
My layperson understanding of "cross-reactive" without writing 30 pages basically means you may have had some form of different coronavirus (one of the other 4 or so types) that give you "some" (varying amounts) protection, even if you haven't been exposed to COVID-19 yet.
SARS-CoV-2 T-cell epitopes define heterologous and COVID-19-induced T-cell recognitionThe SARS-CoV-2 pandemic calls for the rapid development of diagnostic, preventive, and therapeutic approaches. CD4+ and CD8+ T cell-mediated immunity is central for control of and ...