Covid-19 roundup: Vac­cines will need to beat place­bo by 50% to qual­i­fy for FDA OK; UK tri­al drops Kale­tra

The FDA will set the bar for ap­prov­ing a Covid-19 vac­cine at 50% ef­fi­ca­cy, the Wall Street Jour­nal re­port­ed, mean­ing …

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