The U.S. hit a record on Saturday for single-day doses administered at 2.9 million, White House officials overseeing the country’s COVID-19 vaccination effort announced on Monday. Andy Slavitt, the White House COVID-19 response team’s senior adviser, claimed the pace marks the fastest worldwide. … The country is now vaccinating a seven-day average of nearly 2.2 million Americans, up from 900,000 when the Biden administration first took office, Slavitt added.