University of Michigan - Ann Arbor

- G614 was originally rare but became more prominent first in Europe, then in North America, Oceania, and Asia. 
- Sequences that exhibited part of of D614G 4-base haplotype (G614) were first found in China and Germany in late January, where the sequence only had three out of the four mutations found in D614G variant. In February 20, a sequence that exhibited all characteristics of a G614 was found in Italy. Many countries were found to have these variants soon after. 

Origin and increased frequency of G614

https://doi.org/10.1016/j.cell.2020.06.043

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