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Moderna's vaccine is the most effective, but Pfizer and J&J also protect well, CDC-led study says
By Maggie Fox
FDA panel votes against broad rollout of Pfizer booster shot, endorses narrower use
By Lauren Gardner
Covid-19: How effective is a third vaccine dose?
By Zaria Gorvett
FDA advisory panel rejects widespread Pfizer vaccine booster shots
By Lauran Neergaard & Matthew Perrone