The call was tense, the message discouraging. Moncef Slaoui, the head of the Trump administration’s effort to quickly produce a vaccine for the coronavirus, was on the phone at 6 p.m. on Aug. 25 to tell the upstart biotech firm Moderna that it had to slow the final stage of testing its vaccine in humans.

Moderna’s chief executive, Stéphane Bancel, a French biochemical engineer, recognized the implication. In the race to quell the pandemic, he said, “every day mattered.” Now his company, which had yet to bring a single product to market, faced a delay of up to three weeks. Pfizer, the global pharmaceutical giant that was busy testing a similar vaccine candidate and promising initial results by October, would take the obvious lead.

“It was the hardest decision I made this year,” Mr. Bancel said.

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Why did they have to wait?
If it could not prove its vaccine worked well for Black and Hispanic Americans, who have been disproportionately affected by the pandemic, it would not make it over the finish line.