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COVID-19 vaccines might be tweaked if variants get worse

The makers of COVID-19 vaccines are figuring out how to tweak their recipes just in case the shots need an update against worrisome virus mutations.

The makers of COVID-19 vaccines are figuring out how to tweak their recipes just in case the shots need an update against worrisome virus mutations.
The makers of COVID-19 vaccines are figuring out how to tweak their recipes just in case the shots need an update against worrisome virus mutations.Read moreJohn Locher / AP
    by Lauran Neergaard, The Associated Press
    Published