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Will the third dose of the Kovid-19 vaccine help fight new variants? Britain’s big step to find out

Emerging corona virus variants are creating new threats amid ongoing vaccination campaigns around the world. New strains of some viruses are known to be more contagious and resistant to immunity from the approved vaccine. For instance, the Oxford-AstraZeneca covid-19 vaccine has been found to be less effective in testing against the South African variant B.1.351 […]