It's a worrying sign for the U.S. ahead of the holiday travel season: coronavirus infections are rising in more than half of all states. Experts warn this could be the start of an extended winter surge. The rise is a turnaround after cases had steadily declined from mid September to late October. The country is now averaging more than 83,000 cases a day — about a 14% increase compared to a week ago, and 12% more than two weeks ago.