The company’s comments come after California’s top epidemiologist on Sunday issued a statement recommending providers pause vaccination from lot no. 41L20A due to possible allergic reactions that are under investigation.

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.

Moderna said it was working closely with U.S. health regulators to understand the cases and whether pausing the use of the lot was warranted.

Nearly a million doses from the lot have already been distributed to about 1,700 vaccination sites in 37 states, Moderna said.

REUTERS