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Why it takes 2 shots to make mRNA vaccines do their antibody-creating best – and what the data shows on delaying the booster dose

  • Written by William Petri, Professor of Medicine, University of Virginia
imageAfter a second dose of the COVID-19 mRNA vaccine, a swarm of antibodies attacks the virus.Kateryna Kon/Science Photo Library via Getty Images

With the U.S. facing vaccination delays because of worker shortages and distribution problems, federal health officials now say it’s OK to push back the second dose of the two-part vaccine by as much as...

Read more: Why it takes 2 shots to make mRNA vaccines do their antibody-creating best – and what the data...

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