Half the population has pre-existing immunity to SARS-CoV-2! Better than vax!
(covidtest.life)https://covidtest.life/lj-immunolo/"Importantly, we detected SARS-CoV-2-reactive CD4+ T cells in ∼40%–60% of unexposed individuals, suggesting cross-reactive T cell recognition between circulating “common cold” coronaviruses and SARS-CoV-2."
