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First dose of Pfizer, AstraZeneca shots cut transmission, hospitalisation risk, say UK studies
Pfizer vaccine roll out in 'less than 24 hrs', says Donald Trump after US FDA approves emergency use
UK investigates two adverse reactions to Pfizer jab, says people with history of serious allergic reactions shouldn't get inoculated
US to distribute 6.4 million doses of Pfizer-BioNTech COVID-19 vaccine in first tranche by year-end
