People over 75, front-line essential workers should get vaccine next, CDC panel says

Half a million Americans received Pfizer vaccine in first week: CDC

The Centers for Disease Control released its first set of data on the Pfizer coronavirus roll out.

As of Sunday afternoon, at least 556,208 doses have been administered and 2.8 million doses have been distributed throughout the country, according to the CDC.

The first doses were given out to hospital workers, nursing home staff and federal elected officials starting on Dec. 14. Those patients will need a second dose in a few weeks.

The CDC told ABC News it plans to transition this data to agency's COVID Data Tracker in the next couple weeks and have data available down to the jurisdictional level.

A coronavirus vaccine manufactured by Moderna began shipping on Sunday and is slated to be administered this week.

-ABC News' Eric Strauss contributed to this report.

The second COVID-19 vaccine to be authorized by the FDA is now being rolled out.

The first cases of the Moderna vaccine were seen being rolled out from a facility in Olive Branch, Mississippi, to be shipped to the FedEx hub in Memphis, Tennessee, for nationwide distribution on Sunday morning. The shipment was escorted by U.S. Marshalls.

The doses were packed into insulated coolers with specialized cold packs and a temperature monitor, according to pharmaceutical distribution compant McKesson.

The initial vaccine orders will be delivered to administration sites on Monday.

ABC News’ Gio Benitez and Ahmad Hemingway contributed to this report.

Health care company McKesson Corporation has begun distributing Moderna’s COVID-19 vaccine and the ancillary supply kits needed to administer it, they said in a statement Sunday. 

Brian Tyler, the CEO of McKesson, said, “We are honored to be a partner with the U.S. government and other private-sector companies such as Moderna to support in the distribution of COVID-19 vaccines and the ancillary supply kits."

Their vaccine distribution plan, they said, is part of Operation Warp Speed's effort to distribute COVID-19 vaccines to all Americans, and under the direction of the Centers for Disease Control and Prevention (CDC).

"In March, our world seemed to change overnight," Tyler added. "But with a renewed sense of commitment and intensified focus, we’ve come together across industries and forged public and private partnerships to help restore and protect the health and wellbeing of people around the world. With our exceptional group of employees managing the effort, we stand ready as a company to meet this historical moment.”

The 2021 college football semifinal game scheduled to take place Jan. 1 at Rose Bowl Stadium in Pasadena, California, has been moved to AT&T Stadium in Dallas because of COVID-19 concerns.

The decision "was not an easy one," said David Eads, Tournament of Roses CEO and executive director. "While we remain confident that a game could have been played at the Rose Bowl Stadium, as evident in the other collegiate and professional games taking place in the region, the projection of COVID-19 cases in the region has continued on an upward trend."

Sporting events in California since March haven't allowed fans or the families of participants to attend. The Pasadena Tournament of Roses in November and again in December appealed this decision. Both appeals were denied.

-ABC News' Matt Foster contributed to this report