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Novavax American company Novavax, whose COVID-19 vaccine is set to be made in large numbers by the Pune-based Serum Institute of India (SII), has reported that its vaccine has proved to have 89% efficacy in preventing the infection in some trial volunteers in the United Kingdom. However, the efficacy dropped to 60% when it was tested in volunteers in South Africa, a likely consequence of a mutant coronavirus variant that is now deep-rooted there. Since December, scientists have raised
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