Never before have we introduced a vaccine so quickly into the life cycle of a virus. Given the constant mutations that take place until a virus stabilises, the vaccines will have to be updated. They will always be behind the curve, chasing the virus as it adapts to survive. As this article from Nature suggests, it means that 'a considerable advantage for the virus could therefore be provided by mutations that cause the emergence of variants that evade vaccine-induced immunity. These would still replicate in the . . .
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