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Astronuc
Staff Emeritus
Science Advisor
2023 Award
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Università di Bologna - The six strains of SARS-CoV-2
https://www.eurekalert.org/pub_releases/2020-08/udb-tss080320.php
https://www.eurekalert.org/pub_releases/2020-08/udb-tss080320.php
Researchers at the University of Bologna drew from the analysis of 48,635 Coronavirus genomes, which were isolated by researchers in labs all over the world. This study was published in the journal Frontiers in Microbiology. It was then possible for researchers to map the spread and the mutations of the virus during its journey to all continents.
. . .
Currently, there are six strains of coronavirus. The original one is the L strain, that appeared in Wuhan in December 2019. Its first mutation - the S strain - appeared at the beginning of 2020, while, since mid-January 2020, we have had strains V and G. To date strain G is the most widespread: it mutated into strains GR and GH at the end of February 2020.
. . .
In North America, the most widespread strain is GH, while in South America we find the GR strain more frequently. In Asia, where the Wuhan L strain initially appeared, the spread of strains G, GH and GR is increasing. These strains landed in Asia only at the beginning of March, more than a month after their spread in Europe.
Globally, strains G, GH and GR are constantly increasing. Strain S can be found in some restricted areas in the US and Spain. The L and V strains are gradually disappearing.