Thread by @nytimes

The coronavirus vaccine is expected to roll out across the U.S. within days, and the government promises to deliver millions of doses in the coming weeks.

But logistical challenges remain in trying to get the vaccine to the right places at the right time. nyti.ms/3qJAdxP

Manufacturers have struggled to ramp up vaccine production, running short on materials like the bags that line the containers in which the vaccines are made. nyti.ms/3qJAdxP

The U.S. now hopes to have about 40 million doses in 2020, down from a goal of 300 million. But only about 20 million people may get their first shots this month, because the leading vaccines require two doses. nyti.ms/3qJAdxP

Pfizer’s vaccine needs to be shipped and stored at Antarctic winter temperatures, and will be kept in special boxes. Moderna’s vaccine needs regular freezer conditions. nyti.ms/3qJAdxP

Shipping the vaccines to providers across the U.S. will coincide with the busy holiday shipping season, which could cause delays. nyti.ms/3qJAdxP

States choose the vaccines’ final destination:
— The first Pfizer doses are likely to go to hospitals with ultracold freezers.
— CVS and Walgreens may get doses to deliver to nursing homes.
— Eventually, other pharmacies, clinics and workplaces will get them.

Providers will have to manage their inventory and be careful to keep enough on hand to give patients their second booster dose. nyti.ms/3qJAdxP

See more on the potential obstacles to delivering the coronavirus vaccine across the U.S. nyti.ms/3qJAdxP