Before Memorial Day, the majority of coronavirus cases were found in people 45 and older.
Now, the opposite is true.
People under 45 made up 42% of cases before Memorial Day weekend but 55% of cases reported since then, a new USA TODAY analysis has found.
The trend holds in places where new cases are surging and in those that are not, according to the analysis of data from 25 states and the Centers for Disease Control and Prevention.
The rapid growth in coronavirus infections among younger Americans is one factor behind why some states have broken single-day records this week, and it marks a new phase in a U.S. pandemic that first gained widespread attention with a Washington nursing home outbreak in late February and early March.
