Constraining factors.

The first is getting enough supply quickly enough, and the second is the ability to administer the vaccines quickly.

Once they're produced and sent out to the sites, we're taking action to increase supply and increased capacity.

But even so, it will be months before everyone who wants a vaccine will be able to get one.

Any stockpile that may have existed previously no longer exists.

Our practice is to maintain a rolling inventory of 2 to 3 days of supply that we can use to supplement any shortfalls in production and to ensure that we are making deliveries as committed.

But we're passing doses directly along two states very much in real time as they order them.

Pfizer and Madonna are committed to delivering a total of 200 million doses by the end of March, with much of it coming at the end of the quarter so it will accelerate.

Pfizer yesterday announced that they think they can deliver 120 million doses this quarter, and as you heard from the president yesterday, United States plans to purchase an additional 200 million doses for Madonna and Pfizer this year, which will be sufficient to vaccinate every American over the age of 16, and we expect those doses this summer.