New York/Minneapolis — The sprint to find medical breakthroughs to contain Covid-19 stumbled this week, as a pair of pharmaceutical giants working to develop treatments and vaccines suffered setbacks in the clinic.

On Tuesday, Eli Lilly said that enrolment in a government-sponsored clinical trial of its antibody therapy had been paused out of safety concerns. That came less than 24 hours after Johnson & Johnson said research on its experimental vaccine was paused after a study volunteer fell ill...

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