New, more contagious mutations of Covid-19 have emerged in Britain, SA and Brazil and while existing vaccines appear to offer some protection against them, there are fears further changes in the virus could evade current shots.
For GSK, the world's largest vaccine maker by sales, the deal marks a fresh attempt to play a major role in fighting the pandemic after a Covid-19 alliance with Sanofi ran into delays and a collaboration with China's Clover
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