Vaccinating a high percentage of the population against COVID-19 is a crucial part of the U.S. strategy to curb the pandemic. Since COVID-19 vaccine distribution began in the United States on Dec. 14, more than 324 million doses have been administered, fully vaccinating over 153 million people or 46.3% of the total U.S. population. Explore how the vaccine rollout is going in the following five graphics, built using data from the Centers for Disease Control and Prevention.