BRUSSELS — The European Union is finalizing emergency legislation that will give it broad powers to curb exports for the next six weeks of Covid-19 vaccines manufactured in the bloc, a sharp escalation in its response to supply shortages at home that have created a political maelstrom amid a rising third wave on the continent.
A single shot of either the Oxford-AstraZeneca or the Pfizer-BioNTech Covid jab reduces the chance of needing hospital treatment by more than 80%, an analysis in England shows.
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