Cases are already increasing significantly in many states, particularly in the Midwest and Northeast, as variants spread and some governors relax mask mandates and other restrictions. Dr. Walensky said this week that if states and cities continued to loosen public health restrictions, the nation could face a potential fourth wave.
Michigan, one of the worst-hit states, is reporting nearly 6,000 cases a day — up from about 1,000 a day in late February — even though half of its residents over 65 are now fully vaccinated.
And in Ohio, Gov. Mike DeWine said that new variants were aggravating the state’s caseload, even as vaccinations picked up.
“We have to understand that we are in a battle,” he said.
As if to underscore how fragile the nation’s recovery is, a quintessential American ritual — the start of the baseball season — has already faced a virus-related delay.
Major League Baseball officials said on Friday that the league had found only five positive cases in more than 14,000 tests of league personnel. But because four of those people were Washington Nationals players, the team’s Opening Day game against the New York Mets was postponed, and then the team’s full three-game weekend series.
“It’s one of those things that brings it to light that we’re not through it yet,” Brian Snitker, the Atlanta Braves manager, told The Associated Press. “We’re still fighting this.”