Using human blood samples obtained from pre-pandemic donors, a recent article by Mateus et al. in Science provided new evidence that SARS-CoV-2-reactive T-cells in unexposed donors are indeed HCoV-specific T-cells. 1
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Rory D. de Vries (2020) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: