There is a mutation of Covid-19 that has been discovered around London. Mutations happen between generations, and the very short life spans of viruses means that they mutate all the time. This is why you get inoculated against different strains of flu every year. While there is no evidence that this new strain is more deadly, there is some evidence that it spread more easily or more rapidly. Since a virus requires a live host, mutations that make viruses more deadly tend not to enjoy any evolutionary advantage, but that's not to say that a more deadly variant could arise.
The more the virus spreads, the more likely it is to mutate. Wear your damned mask.
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