On the Sunday talk shows, Dr. Deborah Birx, coordinator of the White House coronavirus task force, said she was “very concerned” about scenes of people crowding together over the weekend.

“We really want to be clear all the time that social distancing is absolutely critical. And if you can’t social distance and you’re outside, you must wear a mask,” she said on ABC’s “This Week.”

In Missouri, people packed bars and restaurants at the Lake of the Ozarks, a vacation hot spot popular with Chicagoans, over the weekend. One video showed a crammed pool where vacationers lounged close together without masks, St. Louis station KMOV-TV reported.