Booster shots are being offered to all US adults. Studies suggest boosts can improve protection against symptomatic COVID-19, at least temporarily, with benefits beginning to accrue after a few days.
In a recent study posted to the bioRxiv* preprint server, researchers assessed the impact of pre-existing immunity on messenger ribonucleic acid (mRNA) booster doses of BNT162b2 and mRNA-1273 vaccines ...
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