Booster Campaign Starts Off Strong as US Heads Into the Holidays

As many as 3 million Americans received a COVID-19 vaccine booster shot in the past three days, the White House said Monday. 

Booster shots were authorized for all adults Friday, and between then and Sunday, 1 million people received an additional dose on each day, White House coronavirus response coordinator Jeff Zients said during a Monday press briefing.

At least 36 million Americans have received a booster since the shots were first authorized in September.

For more on this story, go to NBC News.