The emergence of a more contagious strain of the coronavirus first discovered in South Africa has kept vaccine developers around the world on their toes for fear it might impair protection offered by their products.The developers are testing how the variant, known as B.1.351, is affecting the immunisation power induced by their vaccines and preparing to update their booster shot.On Wednesday, Sinovac’s partner in Brazil said its Covid-19 vaccine worked well against the coronavirus variants…


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