Although the initial one- or two-dose vaccination course is effective at preventing hospitalization and death, immunity fades over time. Andriy Onufriyenko/Moment via Getty Images
By Liz Szabo, Kaiser Health News
Even as top U.S. health officials say it’s time America learns to live with the coronavirus, a chorus of leading researchers say faulty messaging on booster shots has left millions of older people at serious risk.
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