Subject: Science and tech Context: Scientists have found that 20-50% people who have not been infected with novel coronavirus (SARS-CoV-2) still harbour memory T cells derived from previous exposures to common cold coronaviruses. The memory T cells were found to cross-react with SARS-CoV-2 Concept: Pre-existing T cell immunity to SARS-CoV-2 could be relevant because it […]