Top officials in charge of making sure that a safe and effective Covid-19 vaccine is swiftly delivered to the American people waved caution flags on Tuesday, all but assuring that a shot won’t be widely available by Election Day.
The Food and Drug Administration has been working for months to hammer out clear standards for vaccines seeking to be fast-tracked to market. The process has placed the agency at odds with the White House, which has wanted to get a shot approved by the time Americans head to the polls on Nov. 3.
On Tuesday, the FDA said it would

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