Those shipments are part of the initial 2.9 million doses that will be distributed nationwide.
As of Monday, coronavirus vaccines already are being sent to 145 sites.
Of those 145 shipments, "we know that 55 have been received. And we'll track the remaining 95 accordingly as we go through the day. We know that the shipments for tomorrow's deliveries have already been packed and checked, and we'll be managing each of those to include Wednesday's shipment," Perna said during a news conference on Monday.
"Now that's the initial 636 shipments that went out for the Pfizer vaccine," Perna said. "We have already identified the follow-on orders for Pfizer vaccine and there'll be an additional 581 shipments that will continue on beyond Wednesday, Thursday, Friday, through the weekend in delivery to the American people."