The FDA issued an emergency use authorization for Gilead Sciences’s antiviral drug remdesivir for patients hospitalized with a severe case of covid-19. The agency’s nod, which was announced by President Trump, came two days after Anthony S. Fauci, the nation’s top infectious-disease expert, announced that trial data showed the drug had a “clear-cut, significant, positive effect in diminishing the time to recovery.”

Here are some significant developments:

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