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The novel coronavirus responsible for the pandemic has mutated. One variant, called B.1.1.7, is more infectious and has forced the UK into lockdown.
The variant has also been discovered in multiple US states and in other countries.
The variant does not appear to be more deadly, and experts believe existing vaccines should work against it.
But Adam Kucharski, an assistant professor at the London School of Hygiene & Tropical Medicine, said that, in general, a variant that's 50% more transmissible is a bigger problem than a variant that's 50% more deadly.
"A really severe disease that one person gets won't necessarily have as much impact as a 'sometimes-severe' disease that a huge number of people get," he told Business Insider.