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Study: Pfizer-BioNTech and AstraZeneca vaccines "highly effective" against COVID variants

Two doses of the COVID-19 vaccines made by Pfizer-BioNTech or AstraZeneca are "highly effective" against variants first detected in India and the United Kingdom, Public Health England announced Saturday.

Why it matters: Some health experts have expressed concerns that contagious new variants could be more resistant against coronavirus vaccines, potentially prolonging the pandemic.

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