FILE - In this Wednesday, July 7, 2021, file photo, patrons enjoy cold tropical cocktails in the tiny interior of the Tiki-Ti bar as it reopens on Sunset Boulevard in Los Angeles. COVID-19 cases have doubled over the past three weeks, driven by the fast-spreading delta variant, lagging vaccination rates in some states and Fourth of July gatherings. Los Angeles County public health officials have urged people to resume wearing masks indoors regardless of their vaccination status. (AP Photo/Damian Dovarganes, File)
The COVID-19 curve in the U.S. is rising again after months of decline, with the number of new cases per day doubling over the past three weeks, driven by the fast-spreading delta variant, lagging vaccination rates and Fourth of July gatherings.