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Worldwide frequency of B.1.1.7, B.1.351, P.1 and D614G variants. Database variants frequency were analyzed from December 2019 to April 30, 2021. hCoV-19/Wuhan is the original reference strain and hCoV-19/D614G is the current reference strain containing the D614G mutation in the S protein. B.1.1.7, B.1.351, and P.1 represent the United Kingdom, South African, and Brazilian variants. *Overlapping curves.
