As the coronavirus SARS-CoV-2 swept across the world and killed more than 1.5 million in the past year, it has mutated into several major groups, or strains, as it adapted to its human hosts. Mapping and understanding those changes to the virus is crucial to developing strategies to combat the #COVID19 disease it causes.
There are currently seven main strains of the virus. The original strain, detected in the Chinese city of Wuhan in December 2019, is the L strain. The virus then mutated into the S strain at the beginning of 2020. That was followed by V and G strains. Strain G mutated yet further into strains GR, GH and GV. Several other infrequent mutations were collectively grouped together as strain O.