7/ This finding was confirmed in yet another study published in Cell in June 2020 showing that 40-60% of unexposed individuals had T cell recognition of SARS-CoV-2.

The authors hypothesized that crossover immunity came from “common cold” coronaviruses.https://t.co/v2boTH9xVa

— James Todaro, MD (@JamesTodaroMD) August 10, 2020