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Think of every infected person as a new chance for the virus to mutate. There's likely to be tonnes of new variants emerge as a result of the huge surge in China.
As long as its a pre-departure test, it means nothing. >

I suppose, at least, it would be helpful to identify any potentially dangerous mutations as early as possible.
Does letting it rip through a billion people increase the chances of mutation, or not since it can spread rapidly and without obstacle?