Fewer than 10 individuals required medical attention over the span of 24 hours," the epidemiologist said in a statement here.

The vaccine maker said it was unaware of comparable cases of adverse events from other vaccination centers which may have administered vaccines from the same lot or from other lots of its vaccine.

A total of 307,300 doses from the lot remain in storage, Moderna said, of the total 1,272,200 doses that were produced in the batch.