Why are new coronavirus variants emerging in the U.S.? NBC NewsBritons lament ‘U.K. variant’ label, as coronavirus strain spreads around the world The Washington PostCoronavirus: How scientists track new variants of the virus Global NewsWhat you need to know about the new COVID-19 variants Medical XpressHow viruses like COVID-19 mutate, and how they impact vaccine development | Just The FAQs USA TODAYView Full Coverage on Google News