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Albert Bourla, Pfizer CEO (John Thys, Pool via AP Images)
Covid-19 roundup: Pfizer vaccine's effectiveness declines faster than AstraZeneca, UK study finds; What about J&J boosters?
Two doses of Pfizer-BioNTech have greater initial effectiveness against new Covid-19 infections, but this effectiveness declines faster than two doses of Oxford-AstraZeneca, according to a …
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