Since vaccine distribution began in the U.S. on Dec. 14, more than 50 million doses have been administered, reaching 11.2% of the total U.S. population, according to federal data collected by the Centers for Disease Control and Prevention. The U.S. is currently administering over 1.6 million shots a day.
Getting millions of people vaccinated, in order of priority, is a big logistical challenge for states. As a result, there’s often a delay between when states receive their federal shipments of vaccines and when they get all the shots into people’s arms.
The speed of vaccination has improved since December, but there are still millions more doses distributed to states than have been administered to people.