The Covid-19 vaccine distribution campaign in the United States began as cargo trucks left Pfizer's production facility in Michigan.

A series of trucks carrying vaccine containers of Covid-19 began with Pfizer's factory in Kalamazoo, Michigan, on the morning of December 13 and began the campaign to distribute the largest, most complex vaccine in American history.

"We've spent months building strategies with Express Campaign officials and clients in the health industry to ensure efficient logistics in the vaccine delivery process. It's time to put the plan into action.

Each Pfizer dry ice-cooled container can hold 4,875 doses of vaccine.

The other 636 locations will receive the vaccine on December 15-16.

Despite months of preparation, distributing and vaccinating 330 million Americans remains a huge logistical challenge, added General Perna.

UPS, FedEx said vaccines are a top priority and will have space on planes and trucks amid rising freight demand due to pandemic and year-end shopping season.

The number of vaccines included in the Campaign Speed Campaign, an initiative of the Trump administration to accelerate the development and distribution of Covid-19 vaccine, will be delivered to all medical centers in the US within three weeks

Health care workers and the elderly in nursing homes will be given priority in the first 2.9 million doses of vaccine given in advance.

The Pfizer vaccine was urgently approved by the US Food and Drug Administration (FDA) on December 11 amid a rising number of Covid-19 cases and deaths in the country in recent days, while

Health officials also reassured Americans that the emergency approval process took place at record speed but still guaranteed to be safe.

The Trump administration has spent billions of dollars developing the Covid-19 vaccines and will be responsible for distribution to the states.