Moderna believes it could update its coronavirus vaccine without a big new trial

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Covid vaccines reprogrammed to aim at new emerging strains of the virus could reach the market quickly, without going through large clinical trials, according to officials at Moderna and the US government.

As researchers identify new, mutated, versions of the coronavirus that causes covid-19, there’s concern they could evade approved vaccines and that new shots could be necessary.

But new shots could come to market in just a few months. The reason: no need for big studies to prove they work.

Moderna Therapeutics chief medical officer, Tal Zaks said that “scientifically” it would be possible to formulate a new

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