648618 external_news 1625688563 1625688563 Scientists are still unsure how long immunity from a Covid-19 vaccine will last, but all indications are that we’ll need periodic booster shots down the road. New Covid-19 variants, like Delta, may also necessitate updated vaccines, much like annual flu shots, says M.G. Finn, Professor and Chair, James A. Carlos Family Chair for Pediatric Technology in the School of Chemistry and Biochemistry. 

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