Coronavirus: new clinical trials raise fears the virus is learning how to resist vaccines

New data showing that two Covid-19 vaccines are far less effective in South Africa than in other places they were tested have heightened fears that the coronavirus is quickly finding ways to elude the world’s most powerful tools to contain it.The US company Novavax reported this week that although its vaccine was nearly 90 per cent effective in clinical trials conducted in Britain, the figure fell to 49 per cent in South Africa – and that nearly all the infections the company analysed in South…

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