A mutated version of the coronavirus, dubbed D614G, is found in 85 per cent of global cases and researchers believe this version is so common because its genetic modification makes it more infectious and better at spreading.
However, analysis from experts at the University of North Carolina found the change did not make it more deadly or likely to cause severe symptoms.
D614G is by far the most common strain of coronavirus affecting humans worldwide and first appeared in February in Europe.
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