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An expert group convened by the World Health Organisation said Tuesday it “strongly supports urgent and broad access” to booster doses, in a reversal of the U.N. agency’s previous insistence that boosters weren’t necessary and contributed to vaccine inequity. In a statement, WHO said its expert group concluded that immunisation with authorised Covid-19 vaccines provide high levels of protection against severe disease and death amid the global circulation of the hugely contagious omicron variant.