The Food and Drug Administration is expected to spell out a tough new standard for an emergency authorization of a coronavirus vaccine as soon as this week that will make it exceedingly difficult for any vaccine to be cleared before Election Day. The agency is issuing the guidance to boost transparency and public trust as it approaches the momentous decision of whether a prospective vaccine is safe and effective. Public health experts are increasingly worried that President Trump’s repeated predictions of a coronavirus vaccine by Nov. 3, coupled with the administration’s interference in federal science agencies, may prompt Americans to reject any vaccine as rushed and potentially tainted.

 

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