New preprint. We assessed the source of T-cell X-reactivity to #SARSCoV2 in unexposed people. Previous exposure to 'common cold' endemic HCoVs plays at most a marginal role, and we found no evidence for a yet-uncharacterised coronavirus in circulation.
1/https://t.co/y4TMOLQRzG

— Prof Francois Balloux (@BallouxFrancois) December 10, 2020