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Pfizer and BioNTech SE said initial lab studies show a third dose of their Covid-19 vaccine may be needed to neutralize the omicron variant, results that will accelerate booster-shot drives around the world.
Existing Covid-19 inoculations will struggle against the fast-spreading Omicron variant, the head of vaccine manufacturer Moderna warned Tuesday, as countries ramp up vaccination programmes and impose further restrictions to curb growing concern.