Cases on the rise in 20 states
The U.S. daily case average has jumped by 15% since the end of October, according to federal data.
Twenty states have seen daily cases jump by at least 10% in the last two weeks: Arizona, California, Colorado, Illinois, Indiana, Iowa, Maine, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Nebraska, Nevada, New Hampshire, New Mexico, New York, Utah, Vermont and Wisconsin.
Cases are still falling in most of the South, which was the first region to get hit hard by the delta surge over the summer. In Florida, where high transmission was reported in every county over the summer, now only 1 out of the 67 counties is reporting high transmission, according to federal data.
-ABC News' Arielle Mitropoulos