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Coronavirus vaccine rollout Slaoui said the US was still aiming to immunize 100 million people by the end of the first quarter of 2021, and another 100 million by halfway through next year, as Pfizer agreed to give 100 million more doses to the US next year after March. That would be just under two-thirds of all Americans. The Pfizer-BioNTech vaccine is given over two doses weeks apart, as are the Moderna vaccines. Rest of Americas Brazilian researchers said the SinoVac vaccine developed by China s Sinovac Biotech was more than 50% effective, but would not release the full results of their research. Brazil was the first country to complete a late-stage trial of the vaccine, but full results from the trial have now been delayed three times. The ongoing delays are likely to fan growing skepticism toward the vaccine in the country.

United statesUnited kingdomCosta ricaSouth africaNorthern irelandGreat britainGrant shappsMoncef slaouiRobert redfieldCarlos alvaradoCenters for diseaseNorthern ireland department of healthNational public health emergency teamDisease controlOperation warp speedSinovac biotech