About 780,000 doses are at the supplier in Denmark, according to the Department of Health and Human Services, which oversees the national stockpile where the vaccines are maintained. The shots have been stored in Denmark awaiting the completion of the FDA on-the-ground inspection and authorization.

“We are working diligently and as fast as we can, and we are aspiring to have that process completed by the end of July,” Peter Marks, who oversees vaccines at the FDA, said in an interview Wednesday.