McKesson Corp, which is distributing the vaccine, said in a statement around 6 a.m. that they had kicked off the rollout of COVID-19 shots and ancillary supply kits.

Shipments of the vaccine arrived at the distribution centers Saturday to be packed into containers and loaded on trucks after the Food and Drug Administration granted the drug emergency use authorization.

The vaccine is expected to be rolled out to more than 3,700 locations across that nation.

The US government has said that it plans to distribute 5.9 million Moderna shots this week on top of 2 million from Pfizer, which was the first vaccine approved in the US.