Johnson & Johnson asked U.S. drug regulators to clear its experimental Covid-19 vaccine for emergency use, setting off a review process that could lead to millions more doses becoming available to step up a stumbling immunization drive.
The drugmaker said in a statement Thursday that it had filed an application for an emergency-use authorization with the U.S. Food and Drug Administration. If cleared, the shot would give the U.S. a third vaccine to try to halt a pandemic that has killed more than 450,000 Americans.
