As it spread from person to person, it changed.
This is what viruses do normally as they spread and they move from one person to another.
If you think of a family tree of the virus, what you get is lots of different branches and twigs appearing.
Wells: So we have viruses with different genetic codes, but not new strains that are meaningfully different from a medical perspective?
We have a new mutation that does seem to have become more dominant in Europe and parts of the U.S.

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