A Phase 2 clinical trial evaluating various additional COVID-19 booster shots has begun enrolling adult participants in the United States. The trial aims to understand if different vaccine regimens – prototype and variant vaccines alone and in combinations – can broaden immune responses in adults who already have received a primary vaccination series and a first booster shot.
NIH begins clinical trial evaluating second COVID-19 booster shots in adults
March 31, 2022
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