The White House said Friday that winter storms have caused a backlog of six million COVID-19 vaccine doses, about three days worth of shipments, but they expect to clear the backlog within a week.

Andy Slavitt, White House senior adviser for the coronavirus response, said the weather had caused delays affecting all 50 states at multiple points along the supply chain. Workers for distributors, FedEx, UPS and McKesson, have been snowed in and unable to get to work, he said, and road closures have also hindered distribution at multiple points along the chain.

In addition, over 2,000 vaccination sites are in areas without power and unable to accept doses.

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Still, Slavitt said, "We anticipate that all the backlogged doses will be delivered within the next week."

That will require working overtime and extending hours in some places. Read more at The Hill