Booster shots: What we’ve learned—and what we still don’t know

This week, the FDA’s vaccine advisory committee had a two-day meeting to discuss booster shots for Moderna’s and Johnson & Johnson’s COVID-19 vaccines. From the outside, these meetings may have appeared fairly straightforward: the committee voted unanimously to recommend booster shots for both vaccines. But in fact, the discussions on both days were wide-reaching and full of questions, touching on the many continued gaps in our knowledge about the need for additional vaccine doses.

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