Pfizer's COVID-19 vaccine shipments begin(1/5)

Boxes containing Pfizer's COVID-19 vaccine are unloaded from air shipping containers at UPS Worldport, in Louisville, Kentucky, Dec. 13, 2020. (Photo/Agencies)

The first shipments of a COVID-19 vaccine for widespread use in the United States has left Michigan to distribution centers across the country, with the first shots expected to be given in the coming week to health care workers and at nursing homes.

Boxes containing the Pfizer-BioNTech COVID-19 vaccine are prepared to be shipped at the Pfizer Global Supply Kalamazoo manufacturing plant in Portage, Michigan, U.S., Dec. 13, 2020. (Photo/Agencies)

Boxes containing the Pfizer-BioNTech COVID-19 vaccine are prepared to be shipped at the Pfizer Global Supply Kalamazoo manufacturing plant in Portage, Michigan, U.S., Dec. 13, 2020. (Photo/Agencies)

A detail of a box containing Pfizer's COVID-19 vaccine is seen in Louisville, Kentucky, Dec. 13, 2020. (Photo/Agencies)

UPS employees move one of two shipping containers of the Pfizer COVID-19 vaccine on ramp at Louisville Muhammad Ali International Airport in Louisville, Kentucky, Dec. 13, 2020. (Photo/Agencies)