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SARS-CoV-2 virion (virus particle), with protein spikes labeled. SARS-CoV-2 is a strain of coronavirus, a single-stranded RNA virus. The name coronavirus is derived from the Latin word for 'crown', referring to the appearance of the many club-shaped protein spikes which form around the virion when viewed under electron microscopy. (KEYSTONE/SCIENCE SOURCE/Spencer Sutton)