- Of the strains analyzed, each strain had on average about 7 mutations. 
- As of now, the G strain and its Gh and GR descendants are the most common strains in the world. The L and V strains are gradually vanishing.
- The G strain likely has higher fitness and has became the predominant strain because its mutation results in a more stable spike protein. The spike protein is responsible for the initial binding of the virus to the host cell. This leads to a an increased amount of the virus, though there was no indication that it caused increased disease severity. 
- There is currently no evidence that one strain is worse than another.

Wayne State University

There are at least six known clades that have arose by differential mutation. They are:
- L clade (original one from Wuhan, China)
- S clade
- V clade
- G clade
- GH clade
- GR clade

The following graphic displays the geographic distribution of these strains.
Note: O stands for "other" mutations that are infrequent and currently unproblematic.

Global Distribution of the 6 Strains

Mercatelli, D., & Giorgi, F. M. (2020). Geographic and Genomic Distribution of SARS-CoV-2 Mutations. Frontiers in Microbiology. https://www.frontiersin.org/articles/10.3389/fmicb.2020.01800/full

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