June 6, 2021 ~ New York Times ~ by Carl Zimmer

We’ll Probably Need Booster Shots for Covid-19. But When? And Which Ones?

Scientists are asking a lot of questions about Covid-19 booster shots, but they don’t yet have many answers. Here’s what they know so far.

As the nation edges closer to President Biden’s goal of a 70 percent vaccination rate, many people are beginning to wonder how long their protection will last.

For now, scientists are asking a lot of questions about Covid-19 booster shots, but they don’t yet have many answers. The National Institutes of Health recently announced that it has begun a new clinical trial of people fully vaccinated — with any authorized vaccine — to see whether a booster of the Moderna shot will increase their antibodies and prolong protection against getting infected with the virus.

Although many scientists estimate that the Pfizer-BioNTech, Moderna and Johnson & Johnson vaccines authorized in the United States will last at least a year, no one knows for sure. It’s also unclear whether emerging variants of the coronavirus will change our vaccination needs.

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