People wait in line for the opening of a 24-hour, walk-up COVID-19 vaccination clinic hosted by the Black Doctors COVID-19 Consortium at Temple University's Liacouras Center in Philadelphia, Friday, Feb. 19, 2021.
Meanwhile, several states have complained about vaccination delays and have had to cancel appointments.
Drug wholesaler McKesson, chosen by the federal government to distribute most COVID-19 vaccines, is handling shipments to hospitals and other medical providers.
Moderna’s vaccine is shipped frozen, at minus 13 degrees Fahrenheit to 5 degrees Fahrenheit (minus 25 to minus 15 degrees Celsius).
In Tennessee, the state’s health agency said distributors have been unable to pack and ship the COVID-19 vaccine this week due to the winter weather.