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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

By William Petri, Professor of Medicine, University of Virginia
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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 six weeks.

As an infectious disease doctor, I’ve been fielding a lot of questions from my patients as well as my friends and family about whether the COVID-19 vaccine will still work if people are late receiving their second dose.

Why you need two doses…


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