The continued spread of the SARS-CoV-2 virus has spawned a Greek alphabet of variants — a naming system used by the World Health Organization to track concerning new mutations of the virus that causes COVID-19. Some have equipped the virus with better ways of infecting humans or evading vaccine protection.
Scientists remain focused on delta, now the dominant variant rising rapidly around the world, but they are tracking others to see what may one day take its place.
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