By the numbers: The U.S. is now adding about 55,000 new cases per day.

The pace of new infections got better over the past week in 13 states, got worse in another 13, and held steady everywhere else.

Michigan saw the biggest jump in new cases, at 53%.

The biggest improvements came in Alabama, Arizona, California and Georgia, each of which saw a decline of over 30% in new cases per day.